[ADD] build most recent docs; support python3

[hbrunn]

you can see the result on https://doc.therp.nl/openupgrade (and didn't we want to move this to some OCA server? Or should we maybe publish this as github pages?)

[hbrunn]

travis error seems unrelated

[StefanRijnhart]

Thanks! Travis error is usually fixed by forcing a different commit (git commit --amend +force push). Can you give it a try?

[StefanRijnhart]

Thanks!

[pedrobaeza]

Please tell me what is needed for moving this to OCA server. cc @sbidoul

[hbrunn]

you'll need python3-sphinx (it has autodoc included already) and a checkout of of latest openupgrade. Then run a cronjob that pulls it every night and runs this script. And configure the webserver to serve /odoo/openupgrade/doc/build/html from this checkout.

[pedrobaeza]

OK, I'm not very used on this sysadmin works, but let's see if @sbidoul can handle this.

[sbidoul]

Can't we do this with readthedocs.io (as I do for mis builder)? Or using travis to publish to github pages (as is done for connector). I'd rather avoid yet another cron on the OCA server, and give full control to projects over the publish of their docs.

If the doc building script does not work for readthedocs, then gh pages should work.

[pedrobaeza]

No problem for me :)

[hbrunn]

I also don't mind. Who needs to do what?