docs(security): remove SSH username/host specifics from public docs

.gitea/workflows/deploy.yml

@@ -9,10 +9,10 @@ on:
 #   REGISTRY            git.librete.ch
 #   REGISTRY_USER       libretech (user-namespace packages — bot can't push)
 #   REGISTRY_PASS       libretech-user PAT scoped write:package
-#   DEPLOY_HOST         root@cloud.librete.ch
-#   DEPLOY_KEY          passphrase-less private key on netcup root authorized_keys
+#   DEPLOY_HOST         user@your-deploy-host
+#   DEPLOY_KEY          passphrase-less private key authorized on deploy host
 #   DEPLOY_PATH         /srv/cc
-#   HEALTH_URL          https://cc.cloud.librete.ch/
+#   HEALTH_URL          https://your-domain/health
 #   VITE_SUPABASE_URL   public; baked at build time
 #   VITE_SUPABASE_ANON_KEY  public-by-design supabase anon key; baked at build time
 #