docs: use tabs and improve grammar in OTP install guide

docs/installation/otp_en.md

@@ -6,7 +6,7 @@
 
 You will be running commands as root. If you aren't root already, please elevate your priviledges by executing `sudo su`/`su`.
 
-While in theory OTP releases are possbile to install on any compatible machine, for the sake of simplicity this guide focuses only on Debian/Ubuntu/Alpine.
+While in theory OTP releases are possbile to install on any compatible machine, for the sake of simplicity this guide focuses only on Debian/Ubuntu and Alpine.
 
 ### Detecting flavour
 
@@ -20,6 +20,7 @@ If your platform is supported the output will contain the flavour string, you wi
 ### Installing the required packages
 
 Other than things bundled in the OTP release Pleroma depends on:
+
 * curl (to download the release build)
 * unzip (needed to unpack release builds)
 * ncurses (ERTS won't run without it)
@@ -27,18 +28,16 @@ Other than things bundled in the OTP release Pleroma depends on:
 * nginx (could be swapped with another reverse proxy but this guide covers only it)
 * certbot (for Let's Encrypt certificates, could be swapped with another ACME client, but this guide covers only it)
 
-Debian/Ubuntu:
+```sh tab="Alpine"
-```sh
-apt install curl unzip libncurses5 postgresql postgresql-contrib nginx certbot
-```
-Alpine:
-
-```sh
 echo "http://nl.alpinelinux.org/alpine/latest-stable/community" >> /etc/apk/repositories
 apk update
 apk add curl unzip ncurses postgresql postgresql-contrib nginx certbot
 ```
 
+```sh tab="Debian/Ubuntu"
+apt install curl unzip libncurses5 postgresql postgresql-contrib nginx certbot
+```
+
 ## Setup
 ### Configuring PostgreSQL
 #### (Optional) Installing RUM indexes
@@ -48,12 +47,7 @@ apk add curl unzip ncurses postgresql postgresql-contrib nginx certbot
 
 RUM indexes are an alternative indexing scheme that is not included in PostgreSQL by default. You can read more about them on the [Configuration page](../configuration/cheatsheet.md#rum-indexing-for-full-text-search). They are completely optional and most of the time are not worth it, especially if you are running a single user instance (unless you absolutely need ordered search results).
 
-Debian/Ubuntu (available only on Buster/19.04):
+```sh tab="Alpine"
-```sh
-apt install postgresql-11-rum
-```
-Alpine:
-```sh
 apk add git build-base postgresql-dev
 git clone https://github.com/postgrespro/rum /tmp/rum
 cd /tmp/rum
@@ -62,25 +56,31 @@ make USE_PGXS=1 install
 cd
 rm -r /tmp/rum
 ```
+
+```sh tab="Debian/Ubuntu"
+# Available only on Buster/19.04
+apt install postgresql-11-rum
+```
+
 #### (Optional) Performance configuration
 For optimal performance, you may use [PGTune](https://pgtune.leopard.in.ua), don't forget to restart postgresql after editing the configuration
 
-Debian/Ubuntu:
+```sh tab="Alpine"
-```sh
-systemctl restart postgresql
-```
-Alpine:
-```sh
 rc-service postgresql restart
 ```
+
+```sh tab="Debian/Ubuntu"
+systemctl restart postgresql
+```
+
 ### Installing Pleroma
 ```sh
-# Create the Pleroma user
+# Create a Pleroma user
 adduser --system --shell  /bin/false --home /opt/pleroma pleroma
 
 # Set the flavour environment variable to the string you got in Detecting flavour section.
-# For example if the flavour is `arm64-musl` the command will be
+# For example if the flavour is `amd64-musl` the command will be
-export FLAVOUR="arm64-musl"
+export FLAVOUR="amd64-musl"
 
 # Clone the release build into a temporary directory and unpack it
 su pleroma -s $SHELL -lc "
@@ -133,49 +133,52 @@ su pleroma -s $SHELL -lc "./bin/pleroma stop"
 
 ### Setting up nginx and getting Let's Encrypt SSL certificaties
 
+#### Get a Let's Encrypt certificate
 ```sh
-# Get a Let's Encrypt certificate
 certbot certonly --standalone --preferred-challenges http -d yourinstance.tld
+```
 
-# Copy the Pleroma nginx configuration to the nginx folder
+#### Copy Pleroma nginx configuration to the nginx folder
-# The location of nginx configs is dependent on the distro
 
-# For Debian/Ubuntu:
+The location of nginx configs is dependent on the distro
+
+```sh tab="Alpine"
+cp /opt/pleroma/installation/pleroma.nginx /etc/nginx/conf.d/pleroma.conf
+```
+
+```sh tab="Debian/Ubuntu"
 cp /opt/pleroma/installation/pleroma.nginx /etc/nginx/sites-available/pleroma.nginx
 ln -s /etc/nginx/sites-available/pleroma.nginx /etc/nginx/sites-enabled/pleroma.nginx
-# For Alpine:
+```
-cp /opt/pleroma/installation/pleroma.nginx /etc/nginx/conf.d/pleroma.conf
-# If your distro does not have either of those you can append
-# `include /etc/nginx/pleroma.conf` to the end of the http section in /etc/nginx/nginx.conf and
-cp /opt/pleroma/installation/pleroma.nginx /etc/nginx/pleroma.conf
 
-# Edit the nginx config replacing example.tld with your (sub)domain
+If your distro does not have either of those you can append `include /etc/nginx/pleroma.conf` to the end of the http section in /etc/nginx/nginx.conf and
+```sh
+cp /opt/pleroma/installation/pleroma.nginx /etc/nginx/pleroma.conf
+```
+
+#### Edit the nginx config
+```sh
+# Replace example.tld with your (sub)domain
 $EDITOR path-to-nginx-config
 
 # Verify that the config is valid
 nginx -t
+```
+#### Start nginx
 
-# Start nginx
+```sh tab="Alpine"
-# For Debian/Ubuntu:
-systemctl start nginx
-# For Alpine:
 rc-service nginx start
 ```
 
-At this point if you open your (sub)domain in a browser you should see a 502 error, that's because pleroma is not started yet.
+```sh tab="Debian/Ubuntu"
+systemctl start nginx
+```
+
+At this point if you open your (sub)domain in a browser you should see a 502 error, that's because Pleroma is not started yet.
 
 ### Setting up a system service
-Debian/Ubuntu:
-```sh
-# Copy the service into a proper directory
-cp /opt/pleroma/installation/pleroma.service /etc/systemd/system/pleroma.service
 
-# Start pleroma and enable it on boot
+```sh tab="Alpine"
-systemctl start pleroma
-systemctl enable pleroma
-```
-Alpine:
-```sh
 # Copy the service into a proper directory
 cp /opt/pleroma/installation/init.d/pleroma /etc/init.d/pleroma
 
@@ -184,13 +187,22 @@ rc-service pleroma start
 rc-update add pleroma
 ```
 
+```sh tab="Debian/Ubuntu"
+# Copy the service into a proper directory
+cp /opt/pleroma/installation/pleroma.service /etc/systemd/system/pleroma.service
+
+# Start pleroma and enable it on boot
+systemctl start pleroma
+systemctl enable pleroma
+```
+
 If everything worked, you should see Pleroma-FE when visiting your domain. If that didn't happen, try reviewing the installation steps, starting Pleroma in the foreground and seeing if there are any errrors.
 
-Still doesn't work? Feel free to contact us on [#pleroma on freenode](https://webchat.freenode.net/?channels=%23pleroma) or via matrix at <https://matrix.heldscal.la/#/room/#freenode_#pleroma:matrix.org>, you can also [file an issue on our Gitlab](https://git.pleroma.social/pleroma/pleroma/issues/new)
+Still doesn't work? Feel free to contact us on [#pleroma on freenode](https://irc.pleroma.social) or via matrix at <https://matrix.heldscal.la/#/room/#freenode_#pleroma:matrix.org>, you can also [file an issue on our Gitlab](https://git.pleroma.social/pleroma/pleroma-support/issues/new)
 
 ## Post installation
 
-### Setting up auto-renew Let's Encrypt certificate
+### Setting up auto-renew of the Let's Encrypt certificate
 ```sh
 # Create the directory for webroot challenges
 mkdir -p /var/lib/letsencrypt
@@ -201,25 +213,8 @@ $EDITOR path-to-nginx-config
 # Verify that the config is valid
 nginx -t
 ```
-Debian/Ubuntu:
-```sh
-# Restart nginx
-systemctl restart nginx
 
-# Ensure the webroot menthod and post hook is working
+```sh tab="Alpine"
-certbot renew --cert-name yourinstance.tld --webroot -w /var/lib/letsencrypt/ --dry-run --post-hook 'systemctl nginx reload'
-
-# Add it to the daily cron
-echo '#!/bin/sh
-certbot renew --cert-name yourinstance.tld --webroot -w /var/lib/letsencrypt/ --post-hook "systemctl reload nginx"
-' > /etc/cron.daily/renew-pleroma-cert
-chmod +x /etc/cron.daily/renew-pleroma-cert
-
-# If everything worked the output should contain /etc/cron.daily/renew-pleroma-cert
-run-parts --test /etc/cron.daily
-```
-Alpine:
-```sh
 # Restart nginx
 rc-service nginx restart
 
@@ -236,15 +231,25 @@ certbot renew --cert-name yourinstance.tld --webroot -w /var/lib/letsencrypt/ --
 ' > /etc/periodic/daily/renew-pleroma-cert
 chmod +x /etc/periodic/daily/renew-pleroma-cert
 
-# If everything worked this should output /etc/periodic/daily/renew-pleroma-cert
+# If everything worked the output should contain /etc/cron.daily/renew-pleroma-cert
 run-parts --test /etc/periodic/daily
 ```
-### Running mix tasks
-Throughout the wiki and guides there is a lot of references to mix tasks. Since `mix` is a build tool, you can't just call `mix pleroma.task`, instead you should call `pleroma_ctl` stripping pleroma/ecto namespace.
 
-So for example, if the task is `mix pleroma.user set admin --admin`, you should run it like this:
+```sh tab="Debian/Ubuntu"
-```sh
+# Restart nginx
-su pleroma -s $SHELL -lc "./bin/pleroma_ctl user set admin --admin"
+systemctl restart nginx
+
+# Ensure the webroot menthod and post hook is working
+certbot renew --cert-name yourinstance.tld --webroot -w /var/lib/letsencrypt/ --dry-run --post-hook 'systemctl reload nginx'
+
+# Add it to the daily cron
+echo '#!/bin/sh
+certbot renew --cert-name yourinstance.tld --webroot -w /var/lib/letsencrypt/ --post-hook "systemctl reload nginx"
+' > /etc/cron.daily/renew-pleroma-cert
+chmod +x /etc/cron.daily/renew-pleroma-cert
+
+# If everything worked the output should contain /etc/cron.daily/renew-pleroma-cert
+run-parts --test /etc/cron.daily
 ```
 
 ## Create your first user and set as admin
@@ -270,4 +275,3 @@ But you should **always check the release notes/changelog** in case there are co
 * [Backup your instance](../administration/backup.md)
 * [Hardening your instance](../configuration/hardening.md)
 * [How to activate mediaproxy](../configuration/howto_mediaproxy.md)
-* [Updating your instance](../administration/updating.md)