Supabase post likes

1. Create a project at supabase.com.
2. Open SQL Editor and run likes.sql once. The file begins with a RESET block that drops prior like objects so you can re-run the whole script safely while iterating.
3. In Integrations → Data API, expose only the public schema (do not expose likes_private).
4. Copy credentials into _config.yml:
   • supabase_url — Project API base URL (HTTPS, no trailing slash), e.g. https://abcdefghijklmnop.supabase.co from the project Connect dialog or homepage.
   • supabase_publishable_key — Settings → API Keys → Publishable (sb_publishable_…). Never commit the Secret key.
5. Rebuild or deploy the site. The like button stays hidden until both values are set.