- add additional migration files

- add seeder for collections
- coverage x_min, x_max, y_min, y_max
- SitelinkController db-independent

app/Http/Requests/Person/CreatePersonRequest.php

@@ -34,7 +34,7 @@ class CreatePersonRequest extends Request
             // ],
             'identifier_orcid' => 'nullable|min:19|max:50',
             'status' => 'required|boolean',
-            'date_of_birth' => 'required|date'
+            'date_of_birth' => 'nullable|date'
         ];
     }
 }