Move to Deno+Bunny.net, add a way to test webring locally.

scripts/build_index.ts

@@ -0,0 +1,10 @@
+import { join } from 'node:path';
+import { generateIndex } from '../src/render_templates.ts';
+
+if (import.meta.main) {
+  const encoder = new TextEncoder();
+  Deno.writeFileSync(
+    join(import.meta.dirname ?? '', '../build/index.html'),
+    encoder.encode(generateIndex())
+  );
+}