Resolve yamllint Issues

[Matthew-Grayson]

🐛 Summary

Revert .yamllint changes made in PR #5 and fix all issues flagged by pre-commit.
To run pre-commit locally, run pre-commit yamllint --all-files

To setup pre-commit, run ./setup-env.
If it fails to run, follow the instructions returned in the console. This includes installing pyenv pyenv-virtualenv, and adding its path to .zhrc.

To run the check-case-conflict hook, run pre-commit run check-case-conflict --all-files.
To run a different hook, replace check-case-conflict with the name of the hook. The list of available hooks is in .pre-commit-config.yaml