Store page author metadata as github username

[mtzeka]

This would especially be neat for when multiple authors are involved.

[rposborne]

👍

[fulldecent]

Hello and thank you for this issue report. There have been several point releases in Prose since this issue was opened and there has not been much discussion here. I wanted to ask if you could please assist in confirming this is still an issue in the latest version of the product. If it is fixed, please close this issue :-)

Since this project is looking for new maintainers (#743), it will be helpful if users can double check the old issues and delete ones that are fixed. This will be super helpful for the new team that works on moving this project forward.

I'm sorry this message is impersonal. And thanks for your help!