docs(init): create documentation website using vitepress

- rename podlibre to adaures
- rename castopod-host to castopod
- simplify README and redirect to docs site
- move INSTALL and UPDATE docs
- add new gitlabci pipeline to deploy docs
- upgrade node to v16 in Dockerfile

modules/Fediverse/Controllers/NodeInfo2Controller.php

@@ -3,7 +3,7 @@
 declare(strict_types=1);
 
 /**
- * @copyright  2021 Podlibre
+ * @copyright  2021 Ad Aures
  * @license    https://www.gnu.org/licenses/agpl-3.0.en.html AGPL3
  * @link       https://castopod.org/
  */
@@ -32,7 +32,7 @@ class NodeInfo2Controller extends Controller
                 'baseUrl' => base_url(),
                 'name' => service('settings')
                     ->get('App.siteName'),
-                'software' => 'Castopod Host',
+                'software' => 'Castopod',
                 'version' => CP_VERSION,
             ],
             'protocols' => ['activitypub'],