Add automatic documentation deployment pipeline
The automatic documentation deployment shall consist in - prepare documentation folder docs as in (https://gitlab.com/drb-python/drb/-/tree/main/docs) including - `conf.py` file to setup sphinx tool - at least index.rst with a description of the implementation in addition to the proposed template in drb. - add in `.gitlab-ci.yml` the `page` entry Contents could be inherited from the README.md, but this file shall stays up-to-date.
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