Add accent colour proposal

config/config.exs

@@ -189,6 +189,7 @@ config :pleroma, :instance,
   email: "example@example.com",
   notify_email: "noreply@example.com",
   description: "Pleroma: An efficient and flexible fediverse server",
+  accent_color: "#4f36bf",
   background_image: "/images/city.jpg",
   instance_thumbnail: "/instance/thumbnail.jpeg",
   limit: 5_000,

lib/pleroma/web/nodeinfo/nodeinfo_controller.ex

@@ -63,6 +63,7 @@ defmodule Pleroma.Web.Nodeinfo.NodeinfoController do
       metadata: %{
         nodeName: Config.get([:instance, :name]),
         nodeDescription: Config.get([:instance, :description]),
+        nodeAccentColor: Config.get([:instance, :accent_color]),
         private: !Config.get([:instance, :public], true),
         suggestions: %{
           enabled: false