website/docs: Balok pr for User docs (#7139)

* procedrual docs

* restructure

* new image, edit tweaks

* more tweaks

* edits

* edits for new button labels

* more content in invitations

* tweaks

* Optimised images with calibre/image-actions

* fixed link

* links

* ken's edits

* changed label name

* spelling checks

* fix links

* links again

* fighting with imports

* ugh

* add extensions back

* fix link

* tweak

* rename file again

* more links

* added punctuation

* use generated index

Signed-off-by: Jens Langhammer <jens@goauthentik.io>

---------

Signed-off-by: Jens Langhammer <jens@goauthentik.io>
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 Langhammer <jens@goauthentik.io>

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