I'm accessing mobile through browser but it shows blank screen when I run the 'index.html' page under 'www' folder.
I downloaded app from below URL.
this is because the repository doesn't include some required libraries. You need to run:
This should be enough to make it work in a browser without ionic serve.
You have a complete guide on how to setup the environment in here:
I want to use it for development purpose but link that you share is older version of Mobile app. I wanna work on Moodle mobile 2. I think I need to implement development environment as Daniel suggested.