Remove trailing '.git' from repo URLs in code search

[pgengler]

Fixes #114

[codecov-io]

Codecov Report

Merging #115 into master will increase coverage by 0.06%.
The diff coverage is 100%.

@@            Coverage Diff            @@
##           master    #115      +/-   ##
=========================================
+ Coverage   75.34%   75.4%   +0.06%     
=========================================
  Files          88      89       +1     
  Lines         734     736       +2     
=========================================
+ Hits          553     555       +2     
  Misses        181     181

Impacted Files	Coverage Δ
app/helpers/clean-repo-url.js	100% <100%> (ø)

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