Issues running on Fedora Linux

[hiltontj]

A user reported that they were unable to run the app on Fedora Linux.

This may be due to missing dependencies. The build that runs during CI uses Ubuntu 20.04, and requires the following dependencies:

sudo apt-get install -y libgtk-3-dev libwebkit2gtk-4.0-dev libappindicator3-dev librsvg2-dev patchelf

I would like to see if running the app in a bare Ubuntu setup works, or if these dependencies are also required in the running environment. From there, I can see about getting it to work on Fedora.

Setup/Installation steps may then be added to the README.