Foundations: Remove reference to the show Silicon Valley (tabs vs spaces)

[mathdebate09]

Because

The video was unavailable and rather unhelpful and had a constant risk of being taken down, thus removing it.

This PR

• Remove the video link
• Add a Reddit discussion

Issue

Closes #28682

Additional Information

I'm somewhat doubtful of the reddit discussion, let me know if needs to be removed, lgtm

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