refactor: add rector to enforce type declarations, code quality + style and remove dead code

- update CI process to include quality stage (tests + code review)
- add captainhook to install git pre-commit & pre-push hooks
- remove .devcontainer Dockerfile to use project's docker-compose services: all
services can now be started automatically using vscode
- update docs/setup-development.md

app/Libraries/ActivityPub/Objects/NoteObject.php

@@ -13,6 +13,7 @@
 
 namespace ActivityPub\Objects;
 
+use ActivityPub\Entities\Note;
 use ActivityPub\Core\ObjectType;
 
 class NoteObject extends ObjectType
@@ -35,10 +36,10 @@ class NoteObject extends ObjectType
     /**
      * @var array
      */
-    protected $replies;
+    protected $replies = [];
 
     /**
-     * @param \ActivityPub\Entities\Note $note
+     * @param Note $note
      */
     public function __construct($note)
     {