WIP

- remove all the tff files
- use only woff2 as it is supported everyhwere
- only load common font weights (regular, italic, bold), we should not
need more, we'll see

for now fonts from all themes are loaded… this should be improved at
some point

- to improve performances and to encourage to have a less "spread out"
design accross the app, we should avoid using loads of font weight
(light, extra bold, light italic, etc.).

I suggest removing all together the unused font weights for now, and
removing from the tokens the extraneous weights.

This makes the app globally faster to load. Also, we use woff2 format
that is widely supported since years now, instead of woff2, to gain a
bit of weight.

this is due to tokens update before

this is mainly to make opendesk demo work better, will clean that so
that it's customizable by theme