ring defaults

[RobinMalfait]

Resolves #2911.

This PR allows you to set default values for the ring utilities, you can define the default offset width and offset color.

module.exports = {
  theme: {
    extend: {
      ringOffsetColor: {
        black: 'black',
        DEFAULT: 'black',
      },
      ringOffsetWidth: {
       4: '4px',
        DEFAULT: '4px'
      }
    },
  },
  variants: {},
  plugins: [],
}

This will allow you to write ring-2 instead of ring-2 ring-offset-black ring-offset-4

[florianbouvot]

Thanks @RobinMalfait

[rightaway]

@RobinMalfait Docs includes DEFAULT info under Ring Width, but not under Ring Offset Width so it isn't clear from reading that it's possible for Offset too.