add field to customize font

[Rickard-Martensson]

Currently the only way to modify the default font is to build it yourself. I feel like its a basic enough feature to give it its own field in the settings

[ErikBjare]

Sorry, but I do not think this is important enough to make it a whole section in the settings. Almost no one will change this setting, so I don't want to maintain it.

If you want to change the font, you can use a browser extension/user style to override. You don't need to rebuild the thing to change it that way.

But since I appreciate the effort, I can still merge the part where you refactored the style.scss, so you get some contributor cred, and can easily override it yourself with user styles :)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (f38648c) 23.76% compared to head (a95a147) 23.76%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #510   +/-   ##
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  Coverage   23.76%   23.76%           
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  Files          27       27           
  Lines        1616     1616           
  Branches      269      269           
=======================================
  Hits          384      384           
  Misses       1206     1206           
  Partials       26       26           

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[ErikBjare]

Not sure what's different for canvas vs default?
Perhaps they should be combined?