TableCell backgroundColor prop & addition of SEAS area colors from palette

[natalynyu]

This PR adds the prop backgroundColor to the TableCell component. Additionally, the SEAS colors for course areas are being added.

Types of changes

• [ ] Bug fix (non-breaking change which fixes an issue)
• [X] 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)
• [x] I have added tests to cover my changes.

Priority:

• [x] Normal
• [ ] High

Related Issues:

Addresses #117

[codecov[bot]]

Codecov Report

Merging #44 into develop will not change coverage by %. The diff coverage is n/a.

@@            Coverage Diff            @@
##           develop       #44   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           21        21           
  Lines          228       230    +2     
  Branches        18        18           
=========================================
+ Hits           228       230    +2     

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