eslint cleanup

What

• ESLint parser for Vue.
• Stricter code rules (Vue components can't use HTML reserved words, no console, etc.).
• Apply new linting rules.
• Fix TS compiler not running.

Why?

• We're currently seeing dozens of warnings/errors in our Nuxt build.
• We don't have an ESLint parser for Vue.
• Reduce bugs.

Closes: #3075 (closed)