✨(homepage) use La Suite-branded homepage:

update DSFR to latest version so that the lasuite-related styles work correctly
integrate La Gaufre button, requiring new directives in CSP urls
stop using "tabs" between intro/help/history, use header homepage link + history link in homepage content.
use DSFR header menu, slightly different on desktop and mobile
use new pad logo (from La Suite repo)
rework a few CSS rules to prevent collision between new dsfr styles, bootstrap and others

To test: yarn + npm run dev to rebuild all assets.

betagouv / pad.numerique.gouv.fr