Mobile app and responsive webpage

I’m a bit stuck. I’ve have an mobile ionic application that is deployed. They want a browser version of the application. I took the application and had to comment out a bunch of the plugin stuff to get it to render in the browser. It renders but is not usable. At first glance, the routing does not appear to work correctly and the menu doesn’t work as expected. Not to mention that is looks pretty poor (as it was designed for a smaller screen).

What is the best way to manage two different release platform, Mobile and Web? I would really like one code base, however, bootstrap doesn’t have the same directives and ionic doesn’t play well with my browser. Any ideas on how I can accomplish as much code reuse and still have native app feel and a responsive website?

What devices are they targeting with the web version? Desktop or mobile?