GEOPY-1866: Create documentation for depth of investigation app

[benk-mira]

GEOPY-1866 - Create documentation for depth of investigation app

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.52%. Comparing base (82f9801) to head (3d324cd).
Report is 27 commits behind head on develop.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop     #163   +/-   ##
========================================
  Coverage    89.52%   89.52%           
========================================
  Files           81       81           
  Lines         4603     4603           
  Branches       607      607           
========================================
  Hits          4121     4121           
  Misses         329      329           
  Partials       153      153           

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[domfournier]

See comments. Can you also remove the picture on top since it is duplicated at the bottom. We can think of something else later.