docs(readme): add registry badges, Install section, and nav link #1

Job	Run time
Validate version tag	6s
Build sdist	19s
Build wheel (x86_64-unknown-linux-gnu)	1m 46s
Build wheel (aarch64-unknown-linux-gnu)	1m 33s
Build addon (x86_64-pc-windows-msvc)	3m 7s
Build wheel (aarch64-apple-darwin)	1m 28s
Build wheel (x86_64-unknown-linux-musl)	2m 1s
Build wheel (x86_64-pc-windows-msvc)	2m 27s
Build addon (aarch64-unknown-linux-gnu)	34s
Build wheel (x86_64-apple-darwin)	16m 38s
Build addon (x86_64-unknown-linux-musl)	2m 17s
Build addon (x86_64-apple-darwin)	16m 38s
Build addon (aarch64-apple-darwin)	1m 5s
Build addon (x86_64-unknown-linux-gnu)	1m 8s
Test / Build bindings	1m 56s
Test / Lint, format & docs	51s
Test / Test (macos-latest)	1m 6s
Test / Test (windows-latest)	2m 22s
Test / Test (ubuntu-latest)	1m 29s
Publish to crates.io	-1s
Publish to npm	1s
Publish to PyPI	1s
GitHub release	1s
	58m 53s

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