fix(docs): routing should always fallback to default (#40061)

docs/index.html

@@ -42,7 +42,7 @@
     <a class="app-name-link" data-nosearch="" href="/">
       <img alt="freeCodeCamp.org" src="images/branding/primary_logo.svg">
     </a>
-    <a class="translations-link" data-nosearch="" href="/#/_translations">
+    <a class="translations-link" data-nosearch="" href="/#/i18n">
       Translations
     </a>
   </div>
@@ -52,12 +52,13 @@
   <script>
     window.$docsify = {
 
-      homepage: 'index.md',
+      homepage: 'index',
 
       relativePath: true,
       // common aliases
       alias: {
-        '.*/_navbar.md': '/_navbar.md'
+        '.*/_navbar.md': '/_navbar.md',
+        '/i18n/?': '/_translations.md'
       },