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Update README.md to add context around Tailwind 4 and PostCSS #998

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Job	Run time
user-install (ubuntu)	1m 38s
tests (3.2)	12s
tests (3.1)	14s
user-install (macos)	1m 7s
tests (head)	9s
user-upgrade (ubuntu)	1m 49s
tests (3.4)	10s
user-upgrade (macos)	2m 3s
tests (3.3)	11s
	7m 33s