Attempt to fix plugin by adding args and refactor

invenio/plugin/custom_invenio_plugin/__init__.py

@@ -1,10 +1,15 @@
 from flask import Blueprint
 
+blueprint = Blueprint(
+    "custom_menu",
+    __name__,
+)
+
 
 def init_app(app):
     """Initialize application."""
-    app.register_blueprint(views.blueprint)
+    app.register_blueprint(blueprint)
+
+    from . import views
+
     return app
-
-
-from . import views