Use relative, local URLs for fonts.

[lechten]

Partially addresses issue #360.

[viebel]

Thanks for your PR @lechten
The problem is that files under the dist folder are generated by this build script: https://github.com/viebel/klipse/blob/master/scripts/build#L16

You need to make your modifications in the build script.

[lechten]

The new commit applies the change to the source file that is copied in the build script.

[viebel]

The problem now is that the css is broken in the case where Klipse is not hosted locally.
The fix should be in the build script: replace the urls before copying codemirror.css to the dist folder

[lechten]

Ah, I hope this is what you had in mind.

[viebel]

That's exactly what I had in mind.
Thank you for improving Klipse