doc: Add support version and NIT doc

[zhongjiajie]

Brief Summary of The Change

Pull Request checklist

I confirm that the following checklist has been completed.

• Add/Change test cases for the changes.
• Add/Change the related documentation, should also change docs/source/config.rst when you change file default_config.yaml.
• (Optional) Add your change to UPDATING.md when it is an incompatible change.

[codecov-commenter]

Codecov Report

Merging #117 (bc71317) into main (bb9e428) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #117   +/-   ##
=======================================
  Coverage   90.75%   90.75%           
=======================================
  Files          63       63           
  Lines        2316     2316           
=======================================
  Hits         2102     2102           
  Misses        214      214           

Flag	Coverage Δ
unittests	90.75% <ø> (ø)

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