docs: update documentation to reflect recent changes/additions (#1730) [skip ci]

* docs: update documentation to reflect recent changes/additions

* docs: add list of third-party integrations

* docs: add v3 warning

* docs: fix Docker for Windows link text

* docs: fix Telegram 'Send Silently' setting description

* docs: note that application URL is required for password reset/generation

* docs: add additional details on webhook template variables

docs/SUMMARY.md

@@ -12,7 +12,9 @@
 - [Users](using-overseerr/users/README.md)
 - [Notifications](using-overseerr/notifications/README.md)
   - [Email](using-overseerr/notifications/email.md)
+  - [Web Push](using-overseerr/notifications/webpush.md)
   - [Discord](using-overseerr/notifications/discord.md)
+  - [LunaSea](using-overseerr/notifications/lunasea.md)
   - [Pushbullet](using-overseerr/notifications/pushbullet.md)
   - [Pushover](using-overseerr/notifications/pushover.md)
   - [Slack](using-overseerr/notifications/slack.md)
@@ -22,9 +24,10 @@
 ## Support
 
 - [Frequently Asked Questions (FAQ)](support/faq.md)
-- [Asking for Support](support/asking-for-support.md)
+- [Need Help?](support/need-help.md)
 
 ## Extending Overseerr
 
-- [Reverse Proxy Examples](extending-overseerr/reverse-proxy-examples.md)
-- [Fail2ban Filter](extending-overseerr/fail2ban.md)
+- [Reverse Proxy](extending-overseerr/reverse-proxy.md)
+- [Fail2ban](extending-overseerr/fail2ban.md)
+- [Third-Party Integrations](extending-overseerr/third-party.md)