CI: Sync web and dev docs automatically with prod server

[datapythonista]

• closes WEB: Deployment of the new website in production #28528

This forgets about the OVH server, and after every merge to master will synchronize the repo web and docs in the production server.

Note that this will delete any file in the server that is not known, except the cheat sheets, and all the docs versions in pandas-doc. I don't think anything else should be kept, but if there is anything else that we upload manually, please let me know. I made a backup in the server, so if we delete anything by accident with this, it can be easily restored.

CC: @TomAugspurger @jorisvandenbossche

[jorisvandenbossche]

Looks good to me.

But not very familiar with the server, to know whether we uploaded things manually in the past.

[TomAugspurger]

delete any file in the server that is not known

Starting in what directory? /usr/share/nginx/ or /usr/share/nginx/pandas?

[TomAugspurger]

I suppose the diff answers my question: nginx/pandas. So this looks good.

Merge when you're ready.

[datapythonista]

Yes, nginx/pandas. Thanks for the reviews.