Documentation update for discussions including sidebar and notifications (#1338)

* Update: Anatomy of discussions

* Made changes to exploring discussion posts

* Refrence error fixes

* Fixed error related to bullet list

* Bullet list fix attempt 2

* Explore discussions page improved

* Fixed some errors

* Fixed image name reference

* Fixed image file path

* Fixed course nav image

* Fixed discussions page image

* Replaced some images as figures

* Added more figures

* Edited add a post page

* Fixed broken link

* Fixed broken link

* Added image of endorsed respons option

* Added sections for when post is closed or edited by a moderator

* Added reported content banner screenshot

* Added screenshot of marked answer indicator

* Made improvements with ChatGPT

* Reorg

* Added notifications section

* Updating hyperlink in notifications doc

* Fixed broken table

* Fixed headings and other styles

* Added response sort image

* Update docs: improved language and screenshots

* Update docs: Fixed reference errors

* Update source/learners/sfd_discussions/discussions_notifications.rst

Co-authored-by: Sarina Canelake <sarina@axim.org>

* Update source/learners/sfd_discussions/take_part_in_discussions.rst

Co-authored-by: Sarina Canelake <sarina@axim.org>

* Update source/learners/sfd_discussions/take_part_in_discussions.rst

Co-authored-by: Sarina Canelake <sarina@axim.org>

* Fixes based on Sarina's comments - Part 1

* Docs: Fixed cross-reference warnings

* Docs: Fixes based on Sarina's comments - Part 2

* Docs: Fixeed duplicate ref error for notifications

* redirects

---------

Co-authored-by: Aamir Ayub <40331925+ayub02@users.noreply.github.com>
Co-authored-by: Aamir  Ayub <aamir.ayub@A006-01388.local>
Co-authored-by: Aamir Ayub <aamir.ayub@arbisoft.com>

Author: 3 people

.gitignore

@@ -4,5 +4,5 @@ _tags
 source/.DS_Store
 .idea/
 sphinx-env/
-venv/
 .venv/
+sphinx.log