Publication after each commit is merged into main

[jpradocueva]

We need to prepare the repository with a workflow that automatically publishes the website after each merge on the main branch.

See similar website: https://guidelines.openmobilealliance.org/ and its workflow: https://github.com/OpenMobileAlliance/dmse-documentation/blob/master/.github/workflows/cd.yml
Also, this is a screenshot of the changes that we need to apply to the repo configuration:

Note: At the moment we CANNOT assign the final domain as it is taken by the current production pages. For the time being we can keep the domain provided by GitHub.

@FroudeDescartes, can you please start looking into it and see how we can make these pages public in a temporal domain? Thanks