Make the code style consistent throughout

[aaronlidman]

• Uses template strings.
• Uses camelCase variable names.
• Requires parenthesis around arrow function arguments.
• Add missing semi colons.
• Adds the rules to eslint to enforce.

[iandees]

Is there a GitHub action we can throw in here to run lint checks?

[aaronlidman]

Yeah, good idea, I'm not familiar but I'll look into it.

[iandees]

I'm going to merge this and add an action in a separate PR.