strip docker type — site-publish is static-content only

Removes type: docker handling from action.yaml, scripts (build/deploy/utils/setup),
and templates (deployment.yaml.j2, service-docker.yaml.j2). Renamed
service-static.yaml.j2 -> service.yaml.j2.

If site.yaml has type: docker, parse_site_yaml() now dies with a clear message
pointing to action/image-build + action/image-push + action/image-deploy with
hand-authored apps-repo manifests. rainsounds.vino.network was the only docker
consumer and has already migrated.

Drops registry-password input from action.yaml (no longer needed).

scripts/setup.py

@@ -24,13 +24,6 @@ def ensure_aws():
     subprocess.run(["aws", "--version"], check=True)
 
 
-def ensure_docker():
-    if shutil.which("docker"):
-        subprocess.run(["docker", "version", "--format", "{{.Client.Version}}"], check=True)
-        return
-    print("WARNING: docker CLI not found — docker builds will fail", file=sys.stderr)
-
-
 def ensure_jinja2():
     try:
         import jinja2
@@ -45,5 +38,4 @@ def ensure_jinja2():
 if __name__ == "__main__":
     ensure_jinja2()
     ensure_aws()
-    ensure_docker()
     print("Setup complete")