Mark-One: Export VARIANT enum from MarkOneTheme

[natalynyu]

Export VARIANT enum from Mark-One so that we can use it in the Course Planner course admin interface

Types of changes

• [X] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• [x] I have run eslint on the code
• [x] I have added JSDoc for all of my code (where applicable)
• [ ] I have added tests to cover my changes.

Priority:

• [x] Normal
• [ ] High

Related Issues:

Addresses #117

[codecov[bot]]

Codecov Report

Merging #40 into develop will not change coverage by %. The diff coverage is n/a.

@@            Coverage Diff            @@
##           develop       #40   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           21        21           
  Lines          222       222           
  Branches        18        18           
=========================================
  Hits           222       222           

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