Added documentation for environments.

[ppasupat]

Description

• Created a class for each environment and wrote documentation in docstrings.
• Generated Markdowns by adapting gen_md.py from Gymnasium.

This PR depends on PR #21.

Type of change

Please delete options that are not relevant.

• [ ] Bug fix (non-breaking change which fixes an issue)
• [x] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
• [ ] This change requires a documentation update

Checklist:

• [x] I have run the pre-commit checks with pre-commit run --all-files (see CONTRIBUTING.md instructions to set it up)
• [x] I have commented my code, particularly in hard-to-understand areas
• [x] I have made corresponding changes to the documentation
• [x] My changes generate no new warnings
• [x] I have added tests that prove my fix is effective or that my feature works
• [x] New and existing unit tests pass locally with my changes

[mgoulao]

@ppasupat add a workflow like this https://github.com/Farama-Foundation/Gymnasium/blob/main/.github/workflows/build-docs.yml, you need to change some parts, like "Install Gymnasium" or "Install dependencies" . Generated files should be ignored by git, so I would suggest you remove all Markdown files that are generated using gen_md.py and add a line to the .gitignore with something like docs/environments/miniwob/*.md.

[ppasupat]

I added build-docs.yml and the files it mentions. I also added .gitignore.