Task: Get ESLint + Prettier working for Vue files

[JamesMGreene]

I've noticed that our ESLint and Prettier configuration don't seem to be including and/or achieving what I would've expected with our *.vue files. Guessing we are missing some Vue-specific configuration and/or plugins there. 🔍

Our current git precommit hook only checks if our code linting and/or formatting has errors, but does not actually fix such errors when possible.

This is something that is definitely achievable.

Draft PR from the old backend repo: OpenSourceFellows/amplify-back-end#145

⚠️ ☝🏻 As you can read in that PR, there were some issues I ran into that prevented me from moving ahead with it at the time, even though they may not truly be blockers. 🤷🏻‍♂️

Probably helpful: https://www.digitalocean.com/community/tutorials/vuejs-vue-eslint-prettier