Remove activity stream functionality from controllers and providers.

- Remove activity stream related code and files
- Update configuration for HtmlSanitizer and RetryGuzzle
- Add `paginate` macro for `Collection`
- Remove unused code for `Codebird`
- Simplify `FrontPageController` and `NotesController` methods

app/Http/Controllers/NotesController.php

@@ -23,10 +23,6 @@ class NotesController extends Controller
      */
     public function index(Request $request): View|Response
     {
-        if ($request->wantsActivityStream()) {
-            return (new ActivityStreamsService())->siteOwnerResponse();
-        }
-
         $notes = Note::latest()
             ->with('place', 'media', 'client')
             ->withCount(['webmentions As replies' => function ($query) {
@@ -47,10 +43,6 @@ class NotesController extends Controller
             abort(404);
         }
 
-        if (request()->wantsActivityStream()) {
-            return (new ActivityStreamsService())->singleNoteResponse($note);
-        }
-
         return view('notes.show', compact('note'));
     }