Move notebooks to docs

[lewisjared]

Pull request

Moves the notebooks into the documentation. This should be much easier for new users to find.

This also migrates to our most recent documentation configuration.

Please confirm that this pull request has done the following:

• [x] Documentation added (where applicable)
• [x] Example added (either to an existing notebook or as a new notebook, where applicable)
• [x] Description in CHANGELOG.rst added

[review-notebook-app[bot]]

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Codecov Report

Patch coverage: 100.00% and project coverage change: +0.03 :tada:

Comparison is base (753e83f) 95.77% compared to head (8899081) 95.81%.

:exclamation: Current head 8899081 differs from pull request most recent head 67de14c. Consider uploading reports for the commit 67de14c to get more accurate results

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #239 +/- ## ========================================== + Coverage 95.77% 95.81% +0.03% ========================================== Files 23 23 Lines 2108 2104 -4 Branches 395 390 -5 ========================================== - Hits 2019 2016 -3 Misses 71 71 + Partials 18 17 -1 ``` | [Impacted Files](https://app.codecov.io/gh/openscm/scmdata/pull/239?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=openscm) | Coverage Δ | | |---|---|---| | [src/scmdata/run.py](https://app.codecov.io/gh/openscm/scmdata/pull/239?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=openscm#diff-c3JjL3NjbWRhdGEvcnVuLnB5) | `96.13% <100.00%> (+0.12%)` | :arrow_up: |

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