Add support for Github Flow

[Jonic]

I know that Lazygit supports Git Flow, but a few months after support was added, the author of the original Git Flow document said that he no longer recommends his approach, saying:

This is not the class of software that I had in mind when I wrote the blog post 10 years ago. If your team is doing continuous delivery of software, I would suggest to adopt a much simpler workflow (like GitHub flow) instead of trying to shoehorn git-flow into your team.

I couldn't find any direct reference to Github Flow in other issues, so I thought I'd raise it as something could possibly be supported in the presence of the Github CLI tool.

Is this something that's worth adding to the roadmap?