add support for ember-cli v5.x deprecations

Author: locks

app/templates/index.hbs

@@ -69,6 +69,12 @@
             @models={{array 'ember-cli' 'v4.x'}}
           >v4.x</LinkTo>
         </li>
+        <li class='list-unstyled' data-test-ember-cli-4-link>
+          <LinkTo
+            @route='show'
+            @models={{array 'ember-cli' 'v5.x'}}
+          >v5.x</LinkTo>
+        </li>
       </ul>
     </li>
     <li class='item list-unstyled'>

ember-cli-build.js

@@ -35,6 +35,7 @@ module.exports = function (defaults) {
         '/ember-data/v4.x',
         '/ember-cli/v2.x',
         '/ember-cli/v4.x',
+        '/ember-cli/v5.x',
         ...getDeprecationFilenames(),
       ],
     },

lib/content-docs-generator/index.js

@@ -16,6 +16,7 @@ const contentFolders = [
   'ember-data/v4',
   'ember-cli/v2',
   'ember-cli/v4',
+  'ember-cli/v5',
 ];
 
 const jsonTrees = contentFolders.map(