Separate README.md installation section and add a list of tools which are using Sinergym

[AlejandroCN7]

Description

README.md is too long, so Installation section is separated and referenced in README.md. A list of tools which are using Sinergym is added too. The idea is for the other projects to do a PR on that list.

Motivation and Context

• I have raised an issue to propose this change (required for new features and bug fixes)

Why is this change required? What problem does it solve? Please, reference issue or issues opened previously.

Fixes #(issue or issues)

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:

• Separate installation section from README.md.
• WandB feature updated instead of MLFlow and Tensorboard in README.md.
• Added project list using Sinergym in README.md.
• Update web documentation too.
• Deleted mlflowbuild script from repository root.