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/using-overseerr/notifications/webpush.md

@@ -0,0 +1,17 @@
+# Web Push
+
+The web push notification agent enables you and your users to receive Overseerr notifications in a supported browser.
+
+This notification agent does not require any configuration, but is not enabled in Overseerr by default.
+
+{% hint style="warning" %}
+**The web push agent only works via HTTPS.** Refer to our [reverse proxy examples](../../extending-overseerr/reverse-proxy.md) for help on proxying Overseerr traffic via HTTPS.
+{% endhint %}
+
+To set up web push notifications, simply enable the agent in **Settings → Notifications → Web Push**. You and your users will then be prompted to allow notifications in your web browser.
+
+Users can opt out of these notifications, or customize the notification types they would like to subscribe to, in their user settings.
+
+{% hint style="info" %}
+Web push notifications offer a native notification experience without the need to install an app. iOS devices do not have support for these notifications at this time, however.
+{% endhint %}