Add edx-search configuration to lms

remove django-threaded-multihost

remove "defensive code" until we can figure out how to actually
catch the errors,

Prevent over-expansion of team memberships.

SOL-1187: missing is_active attribute fix

Fix syntax error in teams_tab_spec.js

TNL-3202

Fix and cleanup of API doc

update edx-proctoring to 0.9.x

Mark test as flaky (SOL-1199)

SOL-1192: include Null in filters while making a decision to pick right custom template

Update translations (autogenerated message)

Modifying template for formulaequationinput and fixing CSS

save_cxx slow transaction

Add course id contexts to teams events

Update edX Reverification Block hash to the updated version

SOL-1053 

Remove unnecessary breadcrumbs for Teams tab

TNL-3249

TNL-3248

Teams Instructor Tools bar

Now emitting `edx.team.deleted` event where relevant. Includes tests.
Also includes tests to cover learner_removed events that are fired
as part of the deletion process, as well as learner_removed events
fired from the edit membership view.

Adding these deleted events has brought about a change in the teams
API - the DELETE membership endpoint now takes an optional `admin`
query parameter to differentiate between admin removal and self
removal for analytics purposes.

Also includes some changes needed to get page viewed events working
with admin tools changes made in this PR.

Adding my humble attempts at making the tools match the wireframes
given in invision. Only done via changes in _developer.scss, the
real rules will be made by UX team elsewhere.

Includes preliminary accessibility feedback, and basic RTL.

TNL-1913

Fix i18n for last activity date on team cards

LMS: setting fore/background colors for all sr elements

Add Michael Frey to AUTHORS file

Added Michael Frey to AUTHORS file.

Fix redirecting to topics page after joining a team.

TNL-3164 TNL-3163