Favicon is missing

[chmac]

@LunaUrsa reports there's no favicon showing on the site deployed to GitHub pages.

[chmac]

There doesn't seem to be a favicon.ico file in the app/public folder. Everything in that folder will be copied to the build output folder. I think the simplest thing is to just add the icon there, and then it should be automatically rebuilt by the GitHub action, and should then work.