removing no longer used foqus settings figure from docs

[kbuma]

Fixes/Addresses:

The link to this figure was removed in a recent PR leaving no links to it. Cleaning up and removing the figure.

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 38.78%. Comparing base (6e306a6) to head (ac3b0a5).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1245      +/-   ##
==========================================
+ Coverage   38.75%   38.78%   +0.02%     
==========================================
  Files         164      164              
  Lines       37139    37139              
  Branches     6164     6164              
==========================================
+ Hits        14392    14403      +11     
+ Misses      21611    21597      -14     
- Partials     1136     1139       +3     

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[ksbeattie]

PR #1238 is where the reference to this was removed.