doc: add crate links in README and fix crate-release.md

[studychao]

1. add crate links to crates.io in project README
2. fix wrong steps in crate-release.md

[codecov[bot]]

Codecov Report

Merging #270 (5c88771) into main (75e7fa4) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #270   +/-   ##
=======================================
  Coverage   90.51%   90.51%           
=======================================
  Files          82       82           
  Lines       24574    24574           
=======================================
  Hits        22243    22243           
  Misses       2331     2331           

Flag	Coverage Δ
dbs-address-space	95.30% <ø> (ø)
dbs-allocator	94.98% <ø> (ø)
dbs-arch	96.37% <ø> (ø)
dbs-boot	94.90% <ø> (ø)
dbs-device	92.95% <ø> (ø)
dbs-interrupt	90.42% <ø> (ø)
dbs-legacy-devices	92.77% <ø> (ø)
dbs-miniball	?
dbs-upcall	94.31% <ø> (ø)
dbs-utils	91.25% <ø> (ø)
dbs-virtio-devices	87.47% <ø> (ø)

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