Update index.html

Author: phodal

index.html

@@ -33,12 +33,15 @@
     <script>
         window.$docsify = {
             basePath: '/chapters/',
-            loadSidebar: true
+            loadSidebar: true,
+            alias: {
+              '/.*/_sidebar.md': '/chapters/sidebar.md'
+            }
         };
     </script>
     <script src="//cdn.jsdelivr.net/npm/docsify@4"></script>
     <script src="//cdn.jsdelivr.net/npm/docsify-darklight-theme@latest/dist/index.min.js" type="text/javascript">
     </script>
 </body>
 
-</html>
+</html>