Added -e to pip install commands.

[ppasupat]

Description

Changed pip install . to pip install -e ..

Without -e, the CI tests didn't trigger an error since miniwob/ is also in the working directory, but doc generation silently failed with message No module named 'miniwob.envs'.

Tested in a local branch in my fork (https://ppasupat.github.io/miniwob-plusplus/environments/list/).

Fixes #38

Type of change

Please delete options that are not relevant.

• [x] 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 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)
• [ ] I have commented my code, particularly in hard-to-understand areas
• [ ] I have made corresponding changes to the documentation
• [x] My changes generate no new warnings
• [ ] 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