v2-docs: Add embed section, general review and cleanup #1031

Job	Run time
build-vegafusion-python-linux-64	15m 56s
build-vegafusion-python-osx-arm64	23m 15s
build-vegafusion-python-osx-64	29m 17s
build-vegafusion-python-linux-arm64	16m 59s
build-vegafusion-server-linux-64	17m 27s
build-vegafusion-python-win-64	45m 42s
build-vegafusion-server-linux-arm64	14m 51s
build-vegafusion-server-osx-64	37m 53s
build-vegafusion-server-osx-arm64	25m 24s
build-vegafusion-server-win-64	40m 45s
build-vegafusion-wasm	11m 58s
check-rust	8m 40s
check-vegafusion-python	11m 28s
test-rust (ubuntu-20.04)	27m 4s
test-rust (windows-2022)	49m 6s
test-rust (macos-14)	26m 50s
test-vegafusion-python-linux-64	25m 59s
test-vegafusion-python-osx-arm64	1m 15s
test-vegafusion-python-win-64	2m 6s
	7h 11m 55s

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