Responsive design results in the hiding of important UI elements

[ColinEberhardt]

The project uses responsive design for some of its CSS, hiding elements when the screen becomes narrow.

Currently this results in the tabs being hidden, and the pop-up menu on the right being truncated:

[nkolba]

thanks @ColinEberhardt ! I've created a separate issue for the devtools menu issue. This needs to be solved by rendering the menu in its own window so that it can't be truncated.

For the tabs, it's going to require a bit more thought and investigation. There are some open issues about tabs (rearranging order, tearing out and dropping in, etc) and I wonder if that issue could be addressed as part of a general refactoring to support these other features.