additional dark mode fixes

[jstucke]

• dependency graph
  • fix node text color in dependency graph for dark mode
  • some jshint fixes
  • moved the dark mode JavaScript code into its own file (so it can also be used in dependency_graph.js)
• GraphQL search
  • fixed <pre> elements for dark mode

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.84%. Comparing base (ad4d6d8) to head (a802b85).
Report is 13 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1313      +/-   ##
==========================================
- Coverage   92.23%   91.84%   -0.39%     
==========================================
  Files         379      378       -1     
  Lines       23188    20981    -2207     
==========================================
- Hits        21387    19271    -2116     
+ Misses       1801     1710      -91     

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[maringuu]

The Browse button on the upload also does not change color as opposed to the other buttons.

[jstucke]

The Browse button on the upload also does not change color as opposed to the other buttons.

Yes, I know. But sadly I was unable to fix this, as this is some internal Bootstrap black magic thing that does not seem to be addressable with CSS. Feel free to try, though.