docs: add info about bun as pkg manager #7373

Job	Run time
optimize-ci	4s
detect-changes	7s
Lint	1m 1s
download-previous-rolldown-binaries	10s
Test (Linux x64 musl)	3m 58s
Test (namespace-profile-linux-x64-default, x86_64-unknown-linux-gnu)	1m 17s
Test (windows-latest, x86_64-pc-windows-msvc)	3m 41s
Test (namespace-profile-mac-default, aarch64-apple-darwin)	1m 4s
CLI E2E test (Linux x64 musl)	3m 10s
CLI E2E test (namespace-profile-linux-x64-default, x86_64-unknown-linux-gnu)	1m 5s
CLI E2E test (namespace-profile-mac-default, aarch64-apple-darwin)	1m 7s
CLI E2E test (windows-latest, x86_64-pc-windows-msvc)	4m 19s
CLI snap test (aarch64-apple-darwin, 1/3)	1m 21s
CLI snap test (aarch64-apple-darwin, 3/3)	1m 41s
CLI snap test (x86_64-pc-windows-msvc, 1/3)	5m 3s
CLI snap test (aarch64-apple-darwin, 2/3)	1m 38s
CLI snap test (x86_64-unknown-linux-gnu, 2/3)	2m 22s
CLI snap test (x86_64-pc-windows-msvc, 2/3)	4m 25s
CLI snap test (x86_64-pc-windows-msvc, 3/3)	5m 16s
CLI snap test (x86_64-unknown-linux-gnu, 1/3)	1m 30s
CLI snap test (x86_64-unknown-linux-gnu, 3/3)	2m 24s
Local CLI `vp install` E2E test	0s
done	3s
	46m 46s

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