Add anchors to the `awesome-rust-mentors` website so people can link directly to specific mentors

[yaahc]

[zevaverbach]

@yaahc I assume you'd accept a JS-based implementation of this? Kramdown, the markdown processor used by default by Jekyll, is already creating IDs for all the h3s but there's no programmatic way of accessing those IDs in the markdown itself, I don't think.

[yaahc]

@yaahc I assume you'd accept a JS-based implementation of this?

absolutely! :+1:

[jyn514]

I think this has been done :) e.g. https://rustbeginners.github.io/awesome-rust-mentors/#jane-losare-lusby-yaahc