Remove admin application

[JackMorganNZ]

Fixes #781

[codecov]

Codecov Report

Merging #887 into develop will decrease coverage by <.01%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           develop     #887      +/-   ##
===========================================
- Coverage    99.54%   99.54%   -0.01%     
===========================================
  Files          104      104              
  Lines         3278     3277       -1     
  Branches       385      385              
===========================================
- Hits          3263     3262       -1     
  Misses           7        7              
  Partials         8        8

Impacted Files	Coverage Δ
csunplugged/config/urls.py	100% <ø> (ø)	⬆️

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