[Docs] Update docs and readme

[Tau-J]

Motivation

Modification

BC-breaking (Optional)

Use cases (Optional)

Checklist

Before PR:

• I have read and followed the workflow indicated in the CONTRIBUTING.md to create this PR.
• Pre-commit or linting tools indicated in CONTRIBUTING.md are used to fix the potential lint issues.
• Bug fixes are covered by unit tests, the case that causes the bug should be added in the unit tests.
• New functionalities are covered by complete unit tests. If not, please add more unit tests to ensure correctness.
• The documentation has been modified accordingly, including docstring or example tutorials.

After PR:

• CLA has been signed and all committers have signed the CLA in this PR.

[codecov]

Codecov Report

Patch coverage has no change and project coverage change: +0.02 🎉

Comparison is base (96a35c9) 80.63% compared to head (030e218) 80.65%.

❗ Current head 030e218 differs from pull request most recent head f8b1f3b. Consider uploading reports for the commit f8b1f3b to get more accurate results

Additional details and impacted files

@@             Coverage Diff             @@
##           dev-1.x    #2461      +/-   ##
===========================================
+ Coverage    80.63%   80.65%   +0.02%     
===========================================
  Files          250      250              
  Lines        15103    15103              
  Branches      2618     2618              
===========================================
+ Hits         12178    12182       +4     
+ Misses        2271     2267       -4     
  Partials       654      654              

Flag	Coverage Δ
unittests	80.65% <ø> (+0.02%)	⬆️

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see 1 file with indirect coverage changes

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