feat: configurable favicon service URL (#659)

src/lib/faviconUrl.ts

@@ -0,0 +1,19 @@
+import UriTemplate from 'uri-templates'
+
+export function faviconUrl(template: string, url: string | URL): string {
+  const u = new URL(url)
+
+  return UriTemplate(template).fill({
+    href: u.href,
+    origin: u.origin,
+    protocol: u.protocol,
+    username: u.username,
+    password: u.password,
+    host: u.host,
+    hostname: u.hostname,
+    port: u.port,
+    pathname: u.pathname,
+    hash: u.hash,
+    search: u.search
+  })
+}

src/lib/link.ts

@@ -72,6 +72,7 @@ export const toGeneralSettings = () => '/settings/general'
 export const toAppearanceSettings = () => '/settings/appearance'
 export const toTranslation = () => '/settings/translation'
 export const toEmojiPackSettings = () => '/settings/emoji-packs'
+export const toSystemSettings = () => '/settings/system'
 export const toProfileEditor = () => '/profile-editor'
 export const toRelay = (url: string) => `/relays/${encodeURIComponent(url)}`
 export const toRelayReviews = (url: string) => `/relays/${encodeURIComponent(url)}/reviews`