Add slides and videos from EuroBSDCon 2022

[lwhsu]

videos: https://www.youtube.com/watch?list=PLskKNopggjc6_N7kpccFZuccgJwHD3TPf

[gkwhite]

Not all of the videos for the conference have been uploaded to youtube yet. There are at least two to go. I've added all the talks with FreeBSD in the title. The conference didn't provide slide decks, so I found a couple. Most don't have slide decks. I'd be happy to reach out to authors where possible. The conference didn't provide slide decks, so I found a couple. Most don't have slide decks. I'd be happy to reach out to authors where possible.