add config for error images

Changelog: Added

.config/example.yml

@@ -133,3 +133,10 @@ redis:
 #allowedPrivateNetworks: [
 #  '127.0.0.1/32'
 #]
+
+# images used on error screens. You can use absolute or relative URLs.
+# If you use relative URLs, be aware that the URL may be used on different pages/paths, so the path component should be absolute.
+#images:
+#  info: /twemoji/1f440.svg
+#  notFound: /twemoji/2049.svg
+#  error: /twemoji/1f480.svg

packages/backend/src/config/load.ts

@@ -38,6 +38,12 @@ export default function load(): Config {
 
 	config.port = config.port || parseInt(process.env.PORT || '', 10);
 
+	config.images = Object.assign({
+		info: '/twemoji/1f440.svg',
+		notFound: '/twemoji/2040.svg',
+		error: '/twemoji/1f480.svg',
+	}, config.images ?? {});
+
 	if (!config.maxNoteTextLength) config.maxNoteTextLength = 3000;
 
 	mixin.version = meta.version;

packages/backend/src/config/types.ts

@@ -67,6 +67,12 @@ export type Source = {
 	mediaProxy?: string;
 	proxyRemoteFiles?: boolean;
 	internalStoragePath?: string;
+
+	images?: {
+		info?: string;
+		notFound?: string;
+		error?: string;
+	};
 };
 
 /**