change gridding_plot extent to auto

[chenyangkang]

No description provided.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 87.46%. Comparing base (d18af0e) to head (e5fe081).
Report is 2 commits behind head on main.

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Additional details and impacted files

@@            Coverage Diff             @@
##             main      #55      +/-   ##
==========================================
+ Coverage   87.24%   87.46%   +0.21%     
==========================================
  Files          30       30              
  Lines        2062     2066       +4     
==========================================
+ Hits         1799     1807       +8     
+ Misses        263      259       -4     

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[chenyangkang]

To #54 :

1. Gridding plot is default to the extent of input data, instead of (-180,180), (-90, 90).
2. Add model.ensemble_df example in AdaSTEM demo doc.

Debug:

1. Fix the GitHub-source download typo.