move blueprints in dedicated folder

app/blueprints/contributions/transkribus_htr_pipeline_models/__init__.py

@@ -0,0 +1,2 @@
+from .. import bp
+from . import routes

app/blueprints/contributions/transkribus_htr_pipeline_models/routes.py

@@ -0,0 +1,7 @@
+from flask import abort
+from . import bp
+
+
+@bp.route('/transkribus_htr_pipeline_models')
+def transkribus_htr_pipeline_models():
+    return abort(503)