docs: initialize earthengine in jupyter-sphinx cells

[12rambau]

related to #337

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.82%. Comparing base (da87ffa) to head (8271e8e).
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #382      +/-   ##
==========================================
- Coverage   90.22%   89.82%   -0.40%     
==========================================
  Files          27       27              
  Lines        1718     1730      +12     
  Branches       83       85       +2     
==========================================
+ Hits         1550     1554       +4     
- Misses        142      150       +8     
  Partials       26       26              

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