Remove broken invidious embeds

[kimg45]

Changes proposed in this PR:

• remove broken invidious embeds and replace with YouTube links

One of the videos doesn’t even seem to be available anymore. I felt the best way to simplify and prevent future breakage is to just link to the original YouTube video instead of embedding it.

Closes #2564

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[dngray]

We should probably investigate to see if these can be fixed first before reverting.