chore(ui): added ESLint configuration #81

Based on Prettier and StandardJS.

Option	Setting
Print Width	80 (default)
Tab Width	2
Tabs	spaces (default)
Semicolons	nope
Quotes	single '
Trailing Commas	all
Bracket Spacing	{ foo: bar } (default)
JSX Brackets	example (default)
Arrow Function Parentheses	always (x) => x

Setup in VSCode

• Install the ESLint extension
• Open VSCode settings and add the following:

{
  "[javascript]": {
    "editor.formatOnSave": false,
  },
  "[javascriptreact]": {
    "editor.formatOnSave": false,
  },
  "eslint.autoFixOnSave": true
}

Todo

• Solve all the linting issues (after merging !71 (merged))