Removing admin related unused components

[jacobo-dominguez-wgu]

Description

Removing unused components related to Admin and AdminPage. This components were not being used since ther is alredy a version two of them.
Closes #1673

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 87.07%. Comparing base (2c550d0) to head (b150e80).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1674      +/-   ##
==========================================
+ Coverage   86.90%   87.07%   +0.17%     
==========================================
  Files         797      780      -17     
  Lines       18181    17683     -498     
  Branches     3723     3682      -41     
==========================================
- Hits        15800    15398     -402     
+ Misses       2314     2210     -104     
- Partials       67       75       +8     

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[diana-villalvazo-wgu]

LGTM! 🚀 but will wait until @kiram15 or @brian-smith-tcril approves/comments before merge it 👍