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Splitting the two is quite straight forward.
Just move all the angularjs code into a separate directory structure and setup the angularjs package as a normal angularjs package. There is an example on the angularjs page: https://docs.angularjs.org/tutorial/step_00.
You can just open the index.html in you browser and everything should work.
OR (this is what I’m normally doing) you serve the angularjs app using a webserver. I’m working on osx which has apache2 pre-installed.
The only thing you will have to change is the authentication which will no longer work once you are serving the angularjs app from a different url.
You can solve this by moving to Token based authentication (make sure to use https in production).
Some guidance can be found here:
Authorization header in AngularJS not working
but there are many more hints to be found on stack overflow so just search stack overflow if you get stuck.