Update doc builder recommendations. (#327)

Following the discussion in #16, I've tried to summarise (and might have
quoted you directly 😄). Picky comments very gratefully received.

## Fixes
- #187

## Relates to
- #16
- #318
- #319

---------

Co-authored-by: Matt Graham <[email protected]>
Co-authored-by: David Stansby <[email protected]>

docs/pages/docs.md

@@ -5,23 +5,69 @@ layout: default
 
 # Documentation
 
-## Doc building
-
-| Name                                            | Short description                                               | 🚦  |
-| ----------------------------------------------- | --------------------------------------------------------------- | :-: |
-| [sphinx](https://www.sphinx-doc.org/en/master/) | Generates documentation from reStructuredText or Markdown files | 🟢  |
-| [gitbook](https://www.gitbook.com/)             | General documentation builder; integrates with GitHub           | 🟠  |
-| [mkdocs](https://www.mkdocs.org/)               | Generates documentation from Markdown files                     | 🟠  |
-| [pdoc](https://pdoc.dev/)                       | Auto-generates API documentation from docstrings                | 🟠  |
-
-<details>
-<summary> 🟢 explanation</summary>
-Sphinx is the de-facto standard that is widely used. It is well tested, reliable and very customisable.
+With Python, as with many other languages, it's very common to automatically
+create a web page with documentation. This can include reference for the API
+taken from your package's [docstrings], tutorials, examples, and more in depth
+explanation about how the package works. For an in-depth discussion of the
+different components of good documentation, see the [Diátaxis
+framework](https://diataxis.fr/). For your package to be easily reusable we
+recommend you build documentation pages and host them somewhere.
+
+If you're using GitHub, one option is to host your docs on [GitHub pages].
+[Here's how we've set this up][template-docs-dot-yaml] for [our template].
+
+<!-- URL used above in the blurb-->
+
+[docstrings]: https://peps.python.org/pep-0257/#what-is-a-docstring
+[GitHub pages]: https://docs.github.com/en/pages
+[our template]: https://github.com/UCL-ARC/python-tooling?tab=readme-ov-file#using-this-template
+[template-docs-dot-yaml]: https://github.com/UCL-ARC/python-tooling/blob/main/%7B%7Bcookiecutter.project_slug%7D%7D/.github/workflows/docs.yml
+
+## Documentation build tools
+
+| Name      | Short description                                                                                                                                               | 🚦  |
+| --------- | --------------------------------------------------------------------------------------------------------------------------------------------------------------- | :-: |
+| [MkDocs]  | Generates documentation from Markdown files, with a plugin to generate API documentation. A good plugin ecosystem and balance of usability and customisability. | 🟢  |
+| [Sphinx]  | Generates documentation from reStructuredText or Markdown files, long been the de-facto standard and very widely used. Mature plugin ecosystem.                 | 🟠  |
+| [gitbook] | General documentation builder; integrates with GitHub.                                                                                                          | 🟠  |
+| [pdoc]    | Auto-generates API documentation from docstrings, beginner friendly but with less of a plugin ecosystem than others.                                            | 🟠  |
+
+<details markdown="block">
+<summary>More details about Sphinx</summary>
+
+We marginally recommend [MkDocs] over [Sphinx] due to it's ease of use,
+preference for Markdown, and more support for a variety of docstring styles.
+
+However the [Sphinx] tool has long been the de-facto standard in the scientific Python ecosystem. It is widely
+used, customisable, and well tested. If you need a [Sphinx
+extension](#sphinx-extensions) that does not have an equivalent [MkDocs
+plugin](https://github.com/mkdocs/catalog), or if you are part of a community
+that heavily uses [Sphinx] then we recommend you use that
+instead.
+
+### See also
+
+- Our internal discussions about which to recommend ([#16](https://github.com/UCL-ARC/python-tooling/issues/16) and [#187](https://github.com/UCL-ARC/python-tooling/issues/187)).
+- [An interesting related discussion](https://github.com/encode/httpx/discussions/1220).
+
 </details>
 
+<!-- URLS used above -->
+
+[MkDocs]: https://www.mkdocs.org/
+[Sphinx]: https://www.sphinx-doc.org/en/master/
+[gitbook]: https://www.gitbook.com/
+[pdoc]: https://pdoc.dev/
+
+## MkDocs plugins
+
+| Name                                                          | Short description                            | 🚦  |
+| ------------------------------------------------------------- | -------------------------------------------- | :-: |
+| [mkdocstrings-python](https://mkdocstrings.github.io/python/) | Automatically generates API reference pages. | 🟢  |
+
 ## Sphinx extensions
 
-| Name                                                                 | Short description                                               | 🚦  |
-| -------------------------------------------------------------------- | --------------------------------------------------------------- | :-: |
-| [sphinx-gallery](https://sphinx-gallery.github.io/stable/index.html) | Builds an HTML gallery of examples from a set of Python scripts | 🟢  |
-| [sphinx-autoapi](https://sphinx-autoapi.readthedocs.io/en/stable/)   | Automatically generates API reference pages.                    | 🟢  |
+| Name                                                                 | Short description                                                | 🚦  |
+| -------------------------------------------------------------------- | ---------------------------------------------------------------- | :-: |
+| [sphinx-gallery](https://sphinx-gallery.github.io/stable/index.html) | Builds an HTML gallery of examples from a set of Python scripts. | 🟢  |
+| [sphinx-autoapi](https://sphinx-autoapi.readthedocs.io/en/stable/)   | Automatically generates API reference pages.                     | 🟢  |