Add a link to migrating docs to home #4480

Job	Run time
build-fuzz	52s
check-git-rev-deps	20s
build-and-test (msrv, ubuntu-latest, x86_64-unknown-linux-gnu)	1m 5s
cargo-deny (advisories)	53s
build-and-test (msrv, ubuntu-latest, aarch64-unknown-linux-gnu, true)	1m 5s
docs	1m 6s
cargo-deny (bans licenses sources)	48s
fmt	16s
migration-docs	19s
publish-dry-run	0s
build-and-test (msrv, windows-latest, x86_64-pc-windows-msvc)	1m 0s
readme	57s
build-and-test (latest, ubuntu-latest, x86_64-unknown-linux-gnu)	1m 6s
build-and-test (latest, ubuntu-latest, aarch64-unknown-linux-gnu, true)	1m 7s
semver-checks	1m 4s
build-and-test (latest, windows-latest, x86_64-pc-windows-msvc)	59s
complete	1s
	12m 58s

Provide feedback