refactor: Wrap entire application in React

[atomrc]

This will completely wrap the messenger application into a react wrapper.

This will allow us to quickly:

• join leave components that are already migrated to React to the root react wrapper
• start using context available to the entire app (not just isolated react trees) for repositories and UIKit config
• start using a state handler at the root level of the app
• start using react-router for routes
• start uniting login page with the rest of the app

[codecov[bot]]

Codecov Report

Merging #13576 (acab35a) into acc (f357bca) will increase coverage by 0.04%. The diff coverage is 13.00%.

@@            Coverage Diff             @@
##              acc   #13576      +/-   ##
==========================================
+ Coverage   40.07%   40.12%   +0.04%     
==========================================
  Files         579      583       +4     
  Lines       20909    20908       -1     
  Branches     4514     4515       +1     
==========================================
+ Hits         8380     8389       +9     
+ Misses      11522    11510      -12     
- Partials     1007     1009       +2     

[atomrc]

Closed for now. Will be done later once the rest of the application is migrated to React