feat: bootstrap design kit and vaporwave demo baseline

kit/scaffolds/go-nethttp-web/web/templates/index.html

@@ -0,0 +1,11 @@
+{{ define "content" }}
+<section class="card">
+  <p>Minimal net/http + html/template scaffold.</p>
+  <ul>
+    <li><code>GET /</code> page</li>
+    <li><code>GET /healthz</code> healthcheck</li>
+    <li><code>/static/*</code> embedded assets</li>
+  </ul>
+</section>
+{{ end }}
+