Fix API docs generation with Scramble 0.13

Scramble 0.13 moved the collected resource type of resource collections
to a different template slot, which broke the custom paginated resource
collection extension and the API docs export. Scramble now infers
paginated responses natively, so the extension, the marker interface and
the @return annotations that overrode the inference are removed.

Scramble 0.13 also documents closure routes, so the API fallback routes
are moved to a controller that is excluded from the docs.

Add a test that exports the API docs.

app/Http/Controllers/Api/V1/ProjectMemberController.php

@@ -36,8 +36,6 @@ class ProjectMemberController extends Controller
     /**
      * Get project members for project
      *
-     * @return ProjectMemberCollection<ProjectMemberResource>
-     *
      * @throws AuthorizationException
      *
      * @operationId getProjectMembers