[obithelight]

What I changed

Replaced every mention of Fly in README.md with the Render + Neon setup:

• Stack line
• OAuth table (heading, homepage URL, callback URL)
• Production login checklist (items 3, 4 and 5)
• "Déploiement" section, rewritten for Render + Neon (Blueprint, secret
  variables, OAuth callback, the two crons, pointer to render.yaml)

Written in French to match the rest of the README, as requested.

Why

Closes #3

Production runs on Render (opentoall.onrender.com), but the README still
pointed new contributors to Fly.

How I checked

• Cross-checked the new deploy section with render.yaml and entrypoint.sh.
• Used the callback URL given in the issue.
• Searched the README for "fly": no mention is left.
• Did not touch CONTRIBUTING.md, so its label links are unchanged.

Questions

1. The issue gave only the callback URL, so I used
   https://opentoall.onrender.com as the Homepage URL. Is that correct?
2. I removed fly deploy and fly.toml and did not add a Render equivalent,
   because the issue says not to invent steps. The deploy section points to
   render.yaml instead.
3. USE_REDIS_CACHE=0 was in the old Fly secrets list but is not in
   render.yaml, so I left it out. Is this okay as per requirements or
   should it still be documented?

[Ymax27]

Thanks a lot @obithelight, this is a clean first PR and exactly the scope the issue asked for.

1. Yes, https://opentoall.onrender.com is the right Homepage URL.
2. Good call. Pointing to render.yaml is what I wanted: the Blueprint handles the deploy, so there's no manual command to document.
3. Fine to leave it out. USE_REDIS_CACHE already defaults to off when no remote Redis URL is set (see config/settings.py), so Render doesn't need it.

I've approved the CI run and will merge once the tests pass 🙌

— Max

[Ymax27]

Merged 🎉 Congrats on your first contribution to OpenToAll, @obithelight, and thanks for the careful cross-checking with render.yaml. New contributors won't land on Fly anymore. Hope to see you around, there are more good first issues waiting!

— Max

[obithelight]

Thank you @Ymax27 for the quick review and clear answers. I learned a lot from this. I'll look at the other good first issues.