Update lint configs / code style

[sambegin]

Just pick a eslint configuration we will be confortable with...

What would be nice is to have a common code style for any IDE.

[wilau2]

I suggest we use prettier with linted-stage and husky.
Option 1. listed here
.lint.staged.json

{
  "*.{js,json,css,md}": [
    "prettier --arrow-parens always --trailing-comma all --single-quote --print-width 100 --write",
    "git add"
  ]
}