Enable compression for result JSON on dashboard

[Kaliumhexacyanoferrat]

The result files loaded by the dashboard are quite large (about 3.5 MiB) and currently not compressed by the server:

As JSON is highly compressible, I would expect a great benefit here.

[Kaliumhexacyanoferrat]

Ah, found the tfb-status repo, will try a PR there.

[Kaliumhexacyanoferrat]

After discussion with @michaelhixson a solution would be to directly serve the results via nginx instead of the Java project, pre-compress the result files and then use gzip_static to serve them compressed.