Update CI_docs_build_and_publish.yml

[fpavogt]

Description:

The docs will be published on any push to master.

Error(s) fixed:

Fixes #14.

Checklists:

• [ ] New code includes dedicated tests.
• [x] New code follows the project's style.
• [x] New code is compatible with BSD 3-Clause license.
• [ ] AUTHORS has been updated.

[fpavogt]

@mcollaudcoen: I'll merge this to fix the bug we talked about. Once I do, you'll need another PR to your branch to stay up-to-date/