Add lint CI/CD

[WillDaSilva]

Description

This PR adds ESLint as a dev dependency, a lint config for ESLint, and a GitHub workflow to run ESLint on every push and pull request.

There are currently lint issues, but they were all pre-existing. Maybe another issue should be opened to address them.

Fixes #5

Type of change

• [X] New feature (non-breaking change which adds functionality)

Screenshots

[vercel[bot]]

Someone is attempting to deploy a commit to a Personal Account owned by @imsaptarshi on Vercel.

@imsaptarshi first needs to authorize it.

[WillDaSilva]

I believe the workflow isn't running here because the .github/workflows/lint.yml file has to exist on main. Bit of a chicken and egg problem, but you can verify that it's running on my fork where the workflow config exists.

[WillDaSilva]

Also I have no idea why the package lockfile was so big. Installing ESLint caused npm to automatically remove over 21k lines.

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