Allow embedding Youtube no-cookies iframe#75

Allow us to embed youtube-nocookie iframe on our blog. Here’s an example of the iframe code:

<iframe width="560" height="315" src="https://www.youtube-nocookie.com/embed/y0ltYApM_tk" title="YouTube video player" frameborder="0" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share" allowfullscreen></iframe>

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