website/docs: RBAC docs (#7191)

* draft rbac docs

* tweaks

* add a permissions topic

* tweaks

* more changes

* draft permissions topic

* more content on roles

* links

* typo

* more conceptual info

* Optimised images with calibre/image-actions

* more content on roles

* add more x-ref links

* fix links

* more content

* links

* typos

* polishing

* Update website/docs/user-group-role/access-control/permissions.md

Co-authored-by: Jens L. <jens@goauthentik.io>
Signed-off-by: Tana M Berry <tanamarieberry@yahoo.com>

* separwate conceptual vs procedural in permissions

* finished groups procedurals

* new page

* added link

* Update website/docs/user-group-role/access-control/permissions.md

Co-authored-by: Jens L. <jens@goauthentik.io>
Signed-off-by: Tana M Berry <tanamarieberry@yahoo.com>

* polish

* edits from PR review

* restructured view section to remove repetition

* rest of edits from PR review

* polished flows and stages

* polish

* typo

---------

Signed-off-by: Tana M Berry <tanamarieberry@yahoo.com>
Co-authored-by: Tana Berry <tana@goauthentik.io>
Co-authored-by: authentik-automation[bot] <135050075+authentik-automation[bot]@users.noreply.github.com>
Co-authored-by: Jens L. <jens@goauthentik.io>

website/docs/expressions/_functions.md

@@ -66,7 +66,7 @@ return ak_is_group_member(request.user, name="test_group")
 
 Fetch a user matching `**filters`.
 
-Returns "None" if no user was found, otherwise returns the [User](/docs/user-group/user) object.
+Returns "None" if no user was found, otherwise returns the [User](/docs/user-group-role/user) object.
 
 Example:
 

website/docs/expressions/_user.md

@@ -1,4 +1,4 @@
--   `user`: The current user. This may be `None` if there is no contextual user. See [User](../user-group/user/user_ref.md#object-properties).
+-   `user`: The current user. This may be `None` if there is no contextual user. See [User](../user-group-role/user/user_ref.md#object-properties).
 
 Example: