Populate docs with continues delivery based on Travis + GitHub

[ikalnytskyi]

If one wants to publish its site on GitHub (i.e. GitHub Pages) there's a way to do this automatically by means of Travis CI. We should provide working example in our docs as most easies and recommended way.

[webknjaz]

Travis CI is no more these days. Years ago, I wrote the first implementation of their integration with GH Pages (travis-ci/dpl@58f6c7d) so it's interesting to see that still being mentioned. Nowadays, it's rather straightforward to publish via GHA: https://github.com/webknjaz/intersphinx-untangled/blob/5eeb7ec/.github/workflows/build-gh-pages.yml#L85-L110.

Though, I'd suggest looking into plugging RTD, where you can also host any static website nowadays, since the configuration is much more flexible nowadays:

• https://github.com/ansible/awx/blob/587f0ec/.readthedocs.yaml
• https://github.com/ansible/docsite/blob/3ae5a22/.readthedocs.yaml
• https://github.com/ansible/jinja-docsite/blob/00290a6/.readthedocs.yaml
• https://github.com/ansible/ansible-documentation/blob/780b4d9/.readthedocs.yaml