update simplify doucment

[zhengming-HIT]

Move the document from README to https://docs.deepmodeling.com/projects/dpgen/en/devel/

[codecov-commenter]

Codecov Report

Merging #912 (4fe9ab0) into devel (8dea29e) will increase coverage by 3.11%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##            devel     #912      +/-   ##
==========================================
+ Coverage   35.13%   38.24%   +3.11%     
==========================================
  Files          96       99       +3     
  Lines       16804    17795     +991     
==========================================
+ Hits         5904     6806     +902     
- Misses      10900    10989      +89     

Impacted Files	Coverage Δ
dpgen/generator/lib/make_calypso.py	70.06% <0.00%> (-7.46%)	⬇️
dpgen/generator/run.py	62.50% <0.00%> (-1.18%)	⬇️
dpgen/data/gen.py	47.88% <0.00%> (-0.60%)	⬇️
dpgen/simplify/simplify.py	0.00% <0.00%> (ø)
dpgen/generator/lib/run_calypso.py	10.00% <0.00%> (ø)
dpgen/generator/lib/calypso_run_opt.py	0.00% <0.00%> (ø)
dpgen/generator/lib/calypso_check_outcar.py	0.00% <0.00%> (ø)
dpgen/generator/lib/calypso_run_model_devi.py	0.00% <0.00%> (ø)
dpgen/auto_test/lib/abacus.py	84.75% <0.00%> (ø)
dpgen/auto_test/Gamma.py	62.84% <0.00%> (ø)
... and 20 more

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[njzjz]

These two parameters are deprecated.