Purge unused styles from Tailwind

[bhgsbatista]

The lighthouse score of this boilerplate suffers due to the inclusion of the full Tailwind CSS stylesheet.

Changing tailwind.config.js to include paths to purge improves the situation:

module.exports = {
  purge: [
    './components/**/*',
    './pages/**/*'
  ],
  theme: {
    extend: {},
  },
  variants: {},
  plugins: [],
  future: {
    removeDeprecatedGapUtilities: true,
    purgeLayersByDefault: true,
  },
};