v2-docs: Add column usage docs #1019

Job	Run time
test-rust (ubuntu-20.04)	20m 42s
build-vegafusion-wasm	5m 1s
test-rust (windows-2022)	36m 27s
build-vegafusion-python-linux-arm64	3m 36s
test-rust (macos-14)	21m 25s
build-vegafusion-python-linux-64	3m 16s
build-vegafusion-python-osx-64	18m 10s
build-vegafusion-python-osx-arm64	11m 35s
build-vegafusion-python-win-64	33m 26s
check-rust	7m 32s
check-vegafusion-python	9m 42s
build-vegafusion-server-linux-64	8m 57s
build-vegafusion-server-linux-arm64	2m 32s
build-vegafusion-server-osx-64	42m 36s
build-vegafusion-server-osx-arm64	11m 12s
build-vegafusion-server-win-64	32m 32s
test-vegafusion-python-linux-64	25m 24s
test-vegafusion-python-osx-arm64	50s
test-vegafusion-python-win-64	2m 0s
	4h 56m 55s

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