[MRG] Use pydata-sphinx-theme

[AlexanderFabisch]

Documentation

• Use pydata-sphinx-theme, remove sphinx-bootstrap-theme. (Fix Documentation: "Site" and "Page" menus don't work anymore #287)
• Fix Open3D scraper for latest version of sphinx-gallery. (Fix Documentation: Open3D scraper is not compatible to pickle #286)
• Show logo in sphinx documentation

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (ea69792) to head (fb80fa8).
Report is 38 commits behind head on develop.

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Additional details and impacted files

@@            Coverage Diff            @@
##           develop      #288   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           31        32    +1     
  Lines         2552      2555    +3     
  Branches       294       294           
=========================================
+ Hits          2552      2555    +3     

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