Add Contributor Covenant Code of Conduct

[aucampia]

Add Contributor Covenant Code of Conduct

This is prompted by @westurner's comments on rdflib-dev.

The code of conduct is added as markdown so that GitHub recognizes it
(see community/community#9442).

Also:

• Add myst-parser in docs extras so that we can compile the code of
  conduct into docs.

[aucampia]

Open to moving the page, GitHub recognizes it in any of the following locations:

.github/CODE_OF_CONDUCT.md
docs/CODE_OF_CONDUCT.md
CODE_OF_CONDUCT.md

I can easily convert it to rst, but the problem is that GitHub does not recognize it as a code of conduct.

I'm also open to not adding myst-parser - and not including it in docs, then it would be best to rename it docs/CODE_OF_CONDUCT.md -> CODE_OF_CONDUCT.md

[aucampia]

Tried various things to make previews available, nothing works well, so here are screenshots:

[nicholascar]

I'm fine with it as-is being recodnised in GitHub and translated across into docs!

[nicholascar]

I don't think we will get additional reviews so merging...

[westurner]

Nice work

Hadn't realized you can just add Myst-parser to extras. JupyterBook (possibly with JupyterLite) is now supported on rtd: https://blog.readthedocs.com/jupyter-book-read-the-docs/

How to deploy a Jupyter Book project to Read the Docs

With the current development version of Jupyter Book, you can now export a Sphinx conf.py configuration from the Jupyter Book declarative _config.yml and save it to disk, which allows Read the Docs to build the documentation from it like any other Sphinx project.

The challenge then becomes keeping both configuration files synchronized, since every update to _config.yml or new Jupyter Book release can potentially produce changes in the conf.py. As described in the official documentation, users can either manually export the configuration running a command at will, or set up an automation to do it on every change.

To see this in action, have a look at this example project that contains the bare minimum to make the demo book work on Read the Docs.

https://github.com/astrojuanlu/jupyterbook-on-read-the-docs

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JupyterLite

• Web: https://jupyterlite.readthedocs.io/en/latest/index.html
• Src: https://github.com/jupyterlite/jupyterlite
• Docs: https://jupyterlite.readthedocs.io/en/latest/user-guide.html#frequently-asked-questions
• Demo: https://jupyterlite.readthedocs.io/en/latest/_static/lab/index.html