* Stop importing cockpit's base1/patternfly.css
This is deprecated API and will be dropped at some point, in favor
of projects shipping their own CSS.
Install and import the styles from PF4 now.
* Use webpack based string replacement for removing the font-face rules from PF4
Doing the seddery in Makefile breaks `npm run build`, webpack watching,
and is generally brittle.
Do the font replacement hacking with `string-replace-loader`, which fits into webpack much more nicely.
There is still some potential simplification by not duplicating the
entire scss loader chain.
Co-authored-by: Martin Pitt <martin@piware.de>
Closes#315
