Add figures to EDMF example

[odunbar]

Purpose

Close #273

NB this is still probably the weakest example as it doesn't have a walkthrough, and due to the computational expense I expect most users would not try to run it. but it is useful to keep and has some expected results now at least.

Content

• add images in docs
• reduce example to just a couple of cases

Docs found here

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• I have read and checked the items on the review checklist.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (a621a04) 88.09% compared to head (5eb15d1) 88.16%.
Report is 8 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #272      +/-   ##
==========================================
+ Coverage   88.09%   88.16%   +0.07%     
==========================================
  Files           7        7              
  Lines        1134     1124      -10     
==========================================
- Hits          999      991       -8     
+ Misses        135      133       -2     

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[odunbar]

merging, this just adds premade figures, and removes code-branches that are not run