use prettier library and clean up the codebase

[gammons]

This codebase is hard to read and needs a bit of standardization with linting. There were also a lot of commented out code and superfluous newlines. This PR helps normalize the codebase so it will be easier to contribute to.

• removed commented-out code
• Removed superfluous newlines
• Cleaned up spacing
• Add prettier to devDependencies in package.json

This PR is similar to #40, but I also added prettier to the devDependencies as well.

For a formatting change like this, it's best to rip the band-aid off quickly, since it changed a lot of code. But it will make it easier to contribute to going forward.

One major caveat - I was not able to test this locally because of #62 . Care should be taken to validate that this PR works before even considering merging.

[SassNinja]

Any update on this topic?

I also immediately noticed the inconsistent code format when starting to read this project's code. Would definitely improve readability if prettier is used.