Standardize code by using a linter and prettifier

[urbanslug]

Use a tool such as:

• eslint to have more standard code
• prettier to have code that is more legible

This would make it easier for people who want to contribute and just easier to understand.

I suggest Google's eslint config because I feel it is more thorough thus leaving less room for bikeshedding.

[odino]

Hey @urbanslug thanks for raising this! I went ahead and merged your PR, I think it makes sense :)