Adopt CLARIN styleguide

[dietervu]

Fonts etc should follow https://www.clarin.eu/content/clarin-eric-style-guide (same for the centre registry)

[MichalGawor]

static files are already in the source code, nginx was not serving the files so reverted to CR styling, move to milestone after PIDMR and MSCR

[dietervu]

Please also add a more specific https://en.wikipedia.org/wiki/Favicon to make the tabs in the browser easier to spot