langserver.github.io
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dark theme add (optional)
CSS adapt for system or browser settings (light or dark).

Now I can read it at night.
@felixfbecker @limitedmage does this look good to merge?
This site needs to get updated to the latest version of Bootstrap. @vitaly-zdanevich if you are interested in helping in a new PR I will merge it asap. In the meantime Closing this PR.