[enh] display form to edit course description
[fix] don't pulldown the navbar when clicking on normal links
[fix] css error
[ref] code beautify
[enh] display message when no course/no thread
[merge] with titou/master
[fix] Remove old `populate` management command
[fix] __repr__ format error
Merge branch 'master' of https://github.com/C4ptainCrunch/beta402
Merge branch 'master' of https://github.com/ekatsah/beta402
[fix] notification_read is not plural
[enh] Spawn notification as document has been processed
[dev] Pictures for test accounts
[enh] Query optimisation
[enh] Query optimisation
[enh] Query optimisation
[fix] don't amend an already published commit...
Merge branch 'master' of github.com:titouanc/beta402 into notifications
Revert "Merge branch 'master' of https://github.com/ekatsah/beta402"

This reverts commit 3ac653de2d9d513a703c392381a78dcee244b144, reversing
changes made to 5446f5e9dc4e08023cfb6753edda5e5fd68e0118.
[fix] Ensure notification uniqueness