Change tags to modules in GUI

[blaukc]

Add modules to GUI so it looks like this now

We should probably make it look better but MVP is MVP

Closes: #41

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 3 lines in your changes are missing coverage. Please review.

Project coverage is 69.56%. Comparing base (9a22769) to head (edaf00f).

Files	Patch %	Lines
src/main/java/seedu/address/ui/StudentCard.java	0.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff            @@
##             master      #42   +/-   ##
=========================================
  Coverage     69.56%   69.56%           
  Complexity      433      433           
=========================================
  Files            81       81           
  Lines          1528     1528           
  Branches        142      142           
=========================================
  Hits           1063     1063           
  Misses          430      430           
  Partials         35       35           

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[taufiq]

phenomenal!