Deployment updates

[rgommers]

We're about to launch the new website, and we don't yet have auto-deploy in place. So let's document here how deployment was done on the old Sphinx site, and then what the new procedure is.

Old Sphinx site:

1. Merge changes into (then) master
2. Check locally
3. cd www && make upload

The upload step did:

upload: html
        cd _build/html && \
            touch .nojekyll && \
            echo numpy.org > CNAME && \
            rm -rf .git && \
            git init && \
            git remote add target [email protected]:numpy/numpy.github.com.git && \
            git add -A && \
            git commit -m "Rebuild site" -a && \
            git push -f target master:master

So numpy.org is served from the https://github.com/numpy/numpy.github.com repo, and that repo only ever contained a single commit with the latest generated sources.

The new procedure is following the Hugo docs on deploying to GitHub Pages (uses a submodule).

[rgommers]

See PR gh-289 for the deploy script. Docs will follow after that's reviewed. For now it does the job.

[rgommers]

See #353 (comment) for the current status on deployment. Still needs work.

[rgommers]

This works fine now, it was fixed in gh-390 (introduce a GH Action that works), gh-391, gh-392 and gh-394 (fix ups). Closing.