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/discord.md

@@ -1,26 +1,16 @@
 # Discord
 
+The Discord notification agent enables you to post notifications to a channel in a server you manage.
+
 {% hint style="info" %}
-The following notification types will mention _all_ users with the **Manage Requests** permission, as these notification types are intended for application administrators rather than end users:
-
-- Media Requested
-- Media Automatically Approved
-- Media Failed
-
-On the other hand, the notification types below will only mention the user who submitted the request:
-
-- Media Approved (does not include automatic approvals)
-- Media Declined
-- Media Available
-
-In order for users to be mentioned in Discord notifications, they must have their [Discord user ID](https://support.discord.com/hc/en-us/articles/206346498-Where-can-I-find-my-User-Server-Message-ID-) configured and **Enable Mentions** checked in their Discord notification user settings.
+Users can optionally opt-in to being mentioned in Discord notifications by configuring their [Discord user ID](https://support.discord.com/hc/en-us/articles/206346498-Where-can-I-find-my-User-Server-Message-ID-) in their user settings.
 {% endhint %}
 
 ## Configuration
 
-{% hint style="info" %}
-To configure Discord notifications, you first need to [create a webhook](https://support.discord.com/hc/en-us/articles/228383668-Intro-to-Webhooks).
-{% endhint %}
+### Webhook URL
+
+You can find the webhook URL in the Discord application, at **Server Settings → Integrations → Webhooks**.
 
 ### Bot Username (optional)
 
@@ -29,7 +19,3 @@ If you would like to override the name you configured for your bot in Discord, y
 ### Bot Avatar URL (optional)
 
 Similar to the bot username, you can override the avatar for your bot.
-
-### Webhook URL
-
-You can find the webhook URL in the Discord application, at **Server Settings → Integrations → Webhooks**.