feat: add miller document layout

apps/server/internal/httpserver/templates/index.gohtml

@@ -1,23 +1,11 @@
 {{ define "index.gohtml" }}{{ template "base" . }}{{ end }}
 
 {{ define "index_content" }}
-<section class="hero-panel">
-  <p class="eyebrow">Foundation</p>
-  <h1>Server-rendered Markdown, secure attachments, and a clean base for sync.</h1>
-  <p class="lede">This milestone focuses on a fast read path. Documents are synchronized from the content directory into content-addressed storage and rendered to HTML on demand.</p>
-</section>
-
-<section class="doc-list">
-  <h2>Documents</h2>
-  <ul>
-    {{ range .Documents }}
-      <li>
-        <a href="/docs/{{ trimMd .Path }}">{{ .Title }}</a>
-        <code>{{ .Path }}</code>
-      </li>
-    {{ else }}
-      <li>No documents found.</li>
-    {{ end }}
-  </ul>
+<section class="workspace-shell workspace-shell--empty">
+  {{ template "browser" .Browser }}
+  <section class="empty-preview">
+    <p class="eyebrow">Documents</p>
+    <h1>MD Hub Secure</h1>
+  </section>
 </section>
 {{ end }}