How can I override the navbar of frappe inside the desk with my navbar in my custom app

Hello v14
I want to replace the stansard frappe navbar inside the desk with my navbar inside my custom app so I can install this app inside any other site and all the customisations reflected on it
also I want to know how can I export all the changes in the desk like editing icon or and change i will do it from the desk to be saved in my custooom app so I can use it in another site with this custom app