Allow URL as favicon

[MeridianGH]

Search Terms

favicon, url, options

Problem

I'd like to use a static, external URL (such as https://raw.githubusercontent.com/.../favicon.png) from a different repository as the favicon. I'm pretty sure this even used to work, maybe before .png support was added in #2791.

Suggested Solution

Maybe test the favicon option with regex or String.startsWith for https?:// and if this check is true, simply use its value as the favicon href.

[Gerrit0]

This might have worked in a plugin which implemented this before it was added to TypeDoc, but never worked here, PR welcome! This is a pretty easy change to make.

[Gerrit0]

... less easy than I thought actually, not quite as trivial as just adjusting the validation function, which is what I thought originally.