WIP notifications and other refactors (#88)

* WIP notifications and other refactors
- refactor notification channels
- send notifications on events related to the servers and sites
- delete server log files on server deletion
- add telegram notification channel
- add new icons
- cache configs and icons on installation and updates
- new navbar for dark mode and settings

* discord channel

* build assets

* pint

app/Enums/NotificationChannel.php

@@ -11,4 +11,6 @@ final class NotificationChannel extends Enum
     const SLACK = 'slack';
 
     const DISCORD = 'discord';
+
+    const TELEGRAM = 'telegram';
 }