Update docs for v0.18.1 release.

[ni4]

No description provided.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 85.46%. Comparing base (744e01e) to head (cbc89a7).
⚠️ Report is 4 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2374   +/-   ##
=======================================
  Coverage   85.46%   85.46%           
=======================================
  Files         126      126           
  Lines       22711    22713    +2     
=======================================
+ Hits        19409    19411    +2     
  Misses       3302     3302           

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[ni4]

@antonsviridenko @ronaldtse @ribose-jeffreylau ping for review, finally CI works.

[ronaldtse]

Thank you @ni4 !