As a developer, I want code linting checks

### Requests

- Personally, I dislike the idea of mandating linting before _every_ push to a **feature branch** because I worry it could negatively impact development speed (sometimes people want to test out stuff without worrying about being perfect)
- However, we should definitely implement linting checks **before a PR could be merged into main** so that our main stays clean

### Linting Tool Recommendations

##### NextJS/frontend

- For NextJS, I really recommend `eslint` as a static linting tool.
- It's pretty much the standard for linting JS/TS
- NextJS has strong support for it
- It's already defined in our `package.json`. All we have to do to lint our frontend code is run `pnpm lint` or `pnpm next lint` (same thing) and it will provide helpful things it catches

##### Python/backend

- I am not familiar with the standard linting tools for Python. Since @riley-1995 works heavily on the Python side, I feel like we should pick a linter that shares her and other devs who work on backend's opinions