v2-docs: Update release instructions, add sync_docs script #1039

Job	Run time
build-vegafusion-python-linux-64	15m 55s
build-vegafusion-python-osx-64	45m 45s
build-vegafusion-python-linux-arm64	15m 59s
build-vegafusion-python-osx-arm64	26m 54s
build-vegafusion-python-win-64	43m 27s
build-vegafusion-server-linux-64	15m 30s
build-vegafusion-server-linux-arm64	15m 2s
build-vegafusion-server-osx-64	43m 38s
build-vegafusion-server-osx-arm64	20m 51s
build-vegafusion-server-win-64	35m 10s
build-vegafusion-wasm	9m 42s
check-rust	6m 35s
check-vegafusion-python	11m 23s
test-rust (ubuntu-20.04)	22m 23s
test-rust (windows-2022)	45m 39s
test-rust (macos-14)	26m 6s
test-vegafusion-python-linux-64	26m 3s
test-vegafusion-python-osx-arm64	1m 21s
test-vegafusion-python-win-64	1m 47s
bundle-vegafusion-server-builds	15s
bundle-vegafusion-python-wheels	6s
	7h 9m 31s

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