Remove two non-public links

[andreamari]

Thanks for going through your talks, you've given a lot!

Do you want me to scrub these URLs from the git history once this is merged?

I think it's not necessary. Unless there is a super easy way of doing it, but I doubt.

[natestemen]

Scrubbed from the history. Not too hard. A little bit of git-foo. If you want, you can delete this PR as well, but up to you.