Update Talks page and add video links

[nathanshammah]

Update the Talks page to put the latest one held from "upcoming" to "past", https://unitary.fund/talks.html, and add video links to the previous ones. It could include embedded html preview of the "Quantum Software Talks" collection from YouTube.
https://support.google.com/youtube/answer/171780?hl=en, https://www.youtube.com/watch?v=yxyqJDC4SUo&list=PL-VMs2BCTI_nnSQmBaccJ1CdQfw5cpHSp.

[willzeng]

@crazy4pi314 I think this is now updated yes? Should we close this issue?

[crazy4pi314]

Yup this is all done, including the video embeds as @nathanshammah suggested.

[nathanshammah]

thanks @crazy4pi314.