Add show to the web ui

[johnynek]

[codecov-commenter]

Codecov Report

Attention: 11 lines in your changes are missing coverage. Please review.

Comparison is base (b73c2b9) 92.30% compared to head (8187844) 92.17%.
Report is 3 commits behind head on master.

Files	Patch %	Lines
...e/src/main/scala/org/bykn/bosatsu/MainModule.scala	8.33%	11 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1137      +/-   ##
==========================================
- Coverage   92.30%   92.17%   -0.14%     
==========================================
  Files          96       96              
  Lines       11037    11048      +11     
  Branches     2597     2625      +28     
==========================================
- Hits        10188    10183       -5     
- Misses        849      865      +16     

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