Allow to specify a favicon using one of the bundled icons

[joapuiib]

Hello,
This has been a question in Material for MkDocs that was not planned to do, although I think it could be a nice addition.

• Allow to specify a favicon using one of the bundled icons squidfunk/mkdocs-material#4206

I've created a customization that allows such feature.

If you think this could be added, I can work on a PR.

[jaywhj]

Does it work in Safari? I read the previous description as if Safari wasn't supported

If it does, then PR is welcome!

[joapuiib]

https://caniuse.com/link-icon-svg

Based on this, is it supported?

[jaywhj]

Go ahead and initiate a PR. I’ll review the code and run some tests — if it works, I’ll merge it.