Deprecation/Removal: Old Registration and Login Implementations (DEPR-52)

Hi there,

We plan to remove old implementations of Login and Registration and consolidate/simplify its relevant code. We are targeting removal as soon as possible, while the edX architecture team is re-platforming that area of the codebase.

Please read for more information and to post any questions/comments. The proposed deadline for comments before acceptance is Nov 1, 2019.