Newest Ubuntu switched Firefox to a snap, which breaks karma.

Try to use playwright to download and cache firefox/chromium
and use those for karma.

Compared to puppeteer where we did this some time ago this caches
the browsers globally, and only downloads them when we start the tests.

lerna complains about this

And remove the custom publish commands

This contains a subsetted version of OTF Source Sans Pro 2.x
(the only version that looks good on low DPI Windows with font-weight 300)

Since there is no package on npm for this and ideally we don't
want to copy around font files this makes it reusable.