Only include css file once

[timja]

I noticed it included many times on the run summary view

[codecov]

Codecov Report

Merging #840 (bbef38f) into master (d1f363c) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master     #840   +/-   ##
=========================================
  Coverage     80.20%   80.20%           
  Complexity     1561     1561           
=========================================
  Files           243      243           
  Lines          5664     5664           
  Branches        422      422           
=========================================
  Hits           4543     4543           
  Misses          965      965           
  Partials        156      156           

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[uhafner]

Ah, I did not know that we have such a flag 👍

I need to check the trend charts as well, maybe I am loading the same JS files multiple times as well.