v(3.5.11) - GitHub Pages and documentation compilation in actions improvement

[AlejandroCN7]

Description

This update separates documentation builds from the rest of the project, with all builds now hosted on the github-pages branch.

Additionally, the project's documentation has been streamlined by mocking the external dependencies of the sinergym module, which reduces the environment requirements in GitHub Actions for deployment automation.

As a result, GitHub Actions workflows have been optimized to make documentation processes simpler and more efficient, and builds have been removed from the main branch.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation (update in the documentation)
• Improvement (of an existing feature)
• Others

Checklist:

• I've read the CONTRIBUTION guide (required)
• My change requires a change to the documentation.
• I have updated the tests.
• I have updated the documentation accordingly.
• I have reformatted the code using autopep8 second level aggressive.
• I have reformatted the code using isort.
• I have ensured cd docs && make spelling && make html pass (required if documentation has been updated.)
• I have ensured pytest tests/ -vv pass. (required).
• I have ensured pytype -d import-error sinergym/ pass. (required)

Changelog:

• Add gcloud and google.cloud to documentations mocks.
• Added a mock class and overwrite WandBOutputFormat (stable baselines 3 dependency).
• Update documentation year.
• Update documentation modules with new mocks.
• Added Python EnergyPlus API to the sphinx mock.
• Github Actions: Documentation process en PR and main push updated, minimal installation required and redirect documentation push to github-pages branch.