Remove unused static assets
Remove old 404 page
Update course enrollments API to allow beta users to see a course.

Also adds me as an author
JIRA: https://openedx.atlassian.net/browse/MA-76
Add endpoint to log in with OAuth access token
Merge pull request #5798 from edx/aleffert/mobile-beta-enrollments-access

https://openedx.atlassian.net/browse/MA-76
Merge pull request #5823 from edx/sarina/delete-unused-lms-assets

Remove unused static assets (LMS)
Generalize assets to any block_type but using
AssetKey and the metadata store
PLAT-204
Merge pull request #5813 from edx/gprice/login-oauth-token

Add endpoint to log in with OAuth access token
Merge pull request #5847 from edx/dhm/generalize_assets

Generalize assets to any block_type but using