Fenix: Add link directly to GitHub from app to report bugs

[github-man]

Hello Firefox Dev Team,

Please add a feedback button to the app so users can give feedback like this without having to sign up to the community forum then github.

Thank you

[cadeyrn]

Please open one issue per feature request otherwise it's not possible for Mozilla to label your individual feature requests.

[Poopooracoocoo]

Let's have this issue just be about adding a link to this repo to the about page as there are other issues for your first two points @github-man

[Poopooracoocoo]

@github-man um could you rename your issue title and desc?