fix: resolve markdown renderer under dashboard subpath (#63)

frontend/index.html

@@ -159,7 +159,7 @@ textarea { resize: vertical; min-height: 120px; }
 
 <div class="footer">Creative AI-imbued UI • stackchain-dashboard</div>
 
-<script src="/static/markdown.js"></script>
+<script src="static/markdown.js"></script>
 <script src="static/commands.js"></script>
 <script>
 (function(){