fix #487

Fix @cartes.data.gouv.fr/#25

* Only keep useful woff/woff2 fonts: http://davidensinger.com/2014/10/update-your-font-face-file-formats-to-just-use-woff-and-woff2/
* Fallback to system fonts: https://www.smashingmagazine.com/2015/11/using-system-ui-fonts-practical-guide/
* Declare fonts with correct weight/style to avoid the change to all elements: http://stackoverflow.com/a/21614532
* Switch from Bold to SemiBold to be consistent with the use of Light by default

Not yet faster but it’s coming!

Swap this wiki link to httpS
The wiki is now on httpS and sadly the httpS redirect causes #anchor links to be lost

cf https://github.com/omab/python-social-auth/blob/master/MIGRATING_TO_SOCIAL.md

Otherwise, each map will react to the `.storage-ui xxx` css rule.