Move jump button logic to tailbone-corepos

since that now supports jump button for Vendor also, maybe others to come

rattail_demo/web/app.py

@@ -15,6 +15,7 @@ def main(global_config, **settings):
     """
     # prefer demo templates over tailbone
     settings.setdefault('mako.directories', ['rattail_demo.web:templates',
+                                             'tailbone_corepos:templates',
                                              'tailbone:templates',])
 
     # for graceful handling of postgres restart