[Launcher UI] Update docs for new launcher

[jamesscottbrown]

No description provided.

[jamesscottbrown]

This is mostly addressed by #77.

However, I can't just add a screenshot of the new launcher because of ove/ove-docs#38

[senakafdo]

You can add screenshots, @jamesscottbrown. See https://ove.readthedocs.io/en/stable/docs/USAGE.html.

The issue you point out is due to some other reason and only impacts files on LFS, I think it may be some issue on GitHub itself. Will have to investigate further.

[jamesscottbrown]

I've also also updated the OVE Usage page (and added a screenshot) in ove/ove-docs#39