Update video links

ateliers/samba-ad.md: Fix link

Add doc

Fix typo

Add workshop

ateliers/index.md: Fix typo

s/@codegouvfr/@CodeGouvFr

Add workshop

Fix link

Finish replacing Dailymotion links

gazette/bluehats_9.md: Replace video link

Use tube.numerique.gouv.fr for videos

Minor typo fixes

gazette/bluehats_20.md: Add link

gazette/bluehats_20.md: Add link to article

gazette/bluehats_20.md: Small tweak

gazette/bluehats_20.md: Minor update

Publish BlueHats gazette n°20

Publish the action plan in english

rencontres/journee-2022.md: Add link to slides