Add video series

[jackabald]

Description

Added @Saumay-Agrawal 's YouTube series into the overview page and an embedding into the intro to the Ethereum page.

Related Issue

#13427

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[github-actions]

This issue is stale because it has been open 30 days with no activity.

[wackerow]

Looks great, thanks @jackabald! Sorry for delays... I just added a commit to pull these into their own section... Unless I missed something, this is a video playlist that you wouldn't be able to access via podcast platforms, so I pulled it to a separate list. The "More of a visual learner" pattern has been used throughout the repo, so adjusted to that as well.

Thanks again!

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