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/README.md

@@ -5,7 +5,9 @@
 Overseerr currently supports the following notification agents:
 
 - [Email](./email.md)
+- [Web Push](./webpush.md)
 - [Discord](./discord.md)
+- [LunaSea](./lunasea.md)
 - [Pushbullet](./pushbullet.md)
 - [Pushover](./pushover.md)
 - [Slack](./slack.md)
@@ -14,11 +16,9 @@ Overseerr currently supports the following notification agents:
 
 ## Setting Up Notifications
 
-Configuring your notifications is quite simple. First, you will need to visit the **Settings** page and click **Notifications** in the menu. This will present you with all of the currently available notification agents. Click on each one individually to configure them.
+Simply configure your desired notification agents in **Settings → Notifications**.
 
-You must configure which type of notifications you want to send _per agent_. If no types are selected, you will not receive notifications!
-
-Note that some notifications are intended for the user who submitted the relevant request, while others are for administrators. For details, please see the documentation for the specific agent you would like to use.
+Users can customize their personal notification preferences in their own user notification settings.
 
 ## Requesting New Notification Agents