Add the demo run to the website pages

[davidorme]

Description

This adds a new page to the docs that contains the current simple walkthrough of running the model. It fixes a couple of minor sphinx issues along the way.

See: https://virtual-ecosystem.readthedocs.io/en/426-add-a-demo-run-to-the-website-pages/virtual_ecosystem/virtual_ecosystem_in_use.html

Closes #426

Type of change

• [x] New feature (non-breaking change which adds functionality)
• [ ] Optimization (back-end change that speeds up the code)
• [ ] Bug fix (non-breaking change which fixes an issue)

Key checklist

• [x] Make sure you've run the pre-commit checks: $ pre-commit run -a
• [x] All tests pass: $ poetry run pytest

Further checks

• [ ] Code is commented, particularly in hard-to-understand areas
• [ ] Tests added that prove fix is effective or that feature works

[codecov-commenter]

Codecov Report

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

Project coverage is 94.68%. Comparing base (13af7ac) to head (b508176).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## develop #428 +/- ## =========================================== + Coverage 94.52% 94.68% +0.16% =========================================== Files 70 70 Lines 3744 3744 =========================================== + Hits 3539 3545 +6 + Misses 205 199 -6 ```

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[davidorme]

Yeah - there's no way to generate this dynamically on request. We'd need a live jupyter server running an instance - which we could do but probably not now 😄

[jacobcook1995]

Yeah that definitely feels like overkill for this PR

[davidorme]

Yeah that definitely feels like overkill for this PR

I think it's probably as simple as using Binder? https://mybinder.org/