Add link to packages docs in the README #2751

Job	Run time
Formatting	18s
Build on ubuntu-latest (nightly)	3m 22s
Build on ubuntu-latest (stable)	3m 35s
Build on macos-latest (nightly)	4m 19s
Build on macos-latest (stable)	3m 34s
Build on windows-latest (nightly)	7m 30s
Build on windows-latest (stable)	8m 9s
Static Analysis (nightly)	2m 0s
Static Analysis (stable)	2m 3s
Units (nightly)	12m 31s
Units (stable)	13m 28s
E2E (nightly)	22m 18s
E2E (stable)	20m 39s
	1h 43m 46s

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