Twenty Twenty-One: Fix typography settings for the quote block

[carolinan]

Trac ticket: https://core.trac.wordpress.org/ticket/55991

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[carolinan]

I removed the cite font size to make it change relatively to the quote block font size.

[carolinan]

I removed this to make the quote symbol size be relative to the font size because it did not look good when the font size was either very small or very large.

[github-actions]

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[carolinan]

I'm not really sure why the letter spacing is used here in the blockquote element, but not on the block. I can't recall. Maybe it was only intended for the classic editor quote.

[github-actions]

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Props poena, mukesh27.

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