DOC: add link to automl and workflow, future features

[Zeroto521]

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[codecov]

Codecov Report

Merging #237 (e4aad53) into master (f278e72) will decrease coverage by 0.97%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #237      +/-   ##
==========================================
- Coverage   99.80%   98.82%   -0.98%     
==========================================
  Files          21       21              
  Lines         512      512              
  Branches       51       51              
==========================================
- Hits          511      506       -5     
- Misses          0        3       +3     
- Partials        1        3       +2     

Impacted Files	Coverage Δ
dtoolkit/accessor/_util.py	80.00% <0.00%> (-20.00%)	⬇️
dtoolkit/accessor/dataframe.py	97.14% <0.00%> (-1.43%)	⬇️

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