sill.md: Tiny update
sill.md: Add link to the list of accepted licenses
sill/fiches/index.md: Fix links
Fix names again
Fix link typo
Fix link name
sill/fiches/index.md: Fix link
sill/fiches/index.md: Don't use TOC
sill/fiches/index.md: Enhance
sill.md: Update title
sill.md: Add link to sill/fiches/index.md
sill.md: Remove useless mention of the license
sill.md: Use standard formatting for headlines
sill.md: Massive update
sill/fiches/*: New files

Copying from https://git.sr.ht/~etalab/sill/, now unlisted.
sill.md: Massive update
licences-libres-dinum.md: Fix typos
evenements/*: Update GTT 3rd workshop date to July 8th
README.md: Update
espaces-communication-bluehats.md: Fix typo