Customizing Kibana 1.13.0

I would like to customize Kibana 1.13.0. the customizations are as below:

  1. By sending a param in the dashboard url, I should be able to hide the Kibana menu and Edit options
  2. I would like to display Percentage values on the column graph

In the past, I could successfully modify Kibana 1.4.0 and customize the above changes.
I removed the bundles from optimize, changed the code files and restarted Kibana. the bundles got recreated and I could see my customizations.

But in this version (Kibana 1.13.0), I cant see the code files. I can only see bundles that too, 4 of them.
I need guidance on how can i customize Kibana 1.13.0