Revert "website: latest migration to new structure" (#11634)

Revert "website: latest migration to new structure (#11522)"

This reverts commit 9a89a5f94b.

website/docs/sources/plex/index.md

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+---
+title: Plex
+---
+
+<span class="badge badge--secondary">Support level: Community</span>
+
+Allows users to authenticate using their Plex credentials
+
+## Preparation
+
+None
+
+## authentik -> Sources
+
+Add _Plex_ as a _source_
+
+-   Name: Choose a name
+-   Slug: Set a slug
+-   Client ID: Set a unique Client Id or leave the generated ID
+-   Press _Load Servers_ to login to plex and pick the authorized Plex Servers for "allowed users"
+-   Decide if _anyone_ with a plex account can authenticate or only friends you share with
+
+Save, and you now have Plex as a source.
+
+:::note
+For more details on how-to have the new source display on the Login Page see [here](../index.md#add-sources-to-default-login-page).
+:::
+
+## Plex source property mappings
+
+See the [overview](../property-mappings/index.md) for information on how property mappings work.
+
+### Expression data
+
+The following variables are available to OAuth source property mappings:
+
+-   `info`: A Python dictionary containing Plex user data.
+-   `auth_api`: A Plex client object to make requests to the Source with authentication built-in.