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

---

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

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

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

```diff @@ 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