ressources.md: Add Techdays participation

codes-sources-algorithmes-publics.md: Sync

With https://github.com/etalab/algorithmes-publics/

Fix and enhance wording

Update

Update contact email

sill.md: Minor fixes

conseil-logiciels-libres.md: Update

bluehats-semester-of-code.md: Add resources

Update CLL meeting

index.md: Remove obsolete link

conseil-logiciels-libres.md: Fix links

bluehats-semester-of-code.md: Expand table formatting

Update BSOC doc

marches-logiciels-libres-liste-contributions.md: Fix and update contributions

gtt-ll-amdac.md: Add link

conseil-logiciels-libres.md: Add GN and CNNum

Use sill.code.gouv.fr

docs/SILL-recherche-utilisateur-T4-2022.pdf: Update

README.md: Update

Update links