Remove experimental and future options from config

https://tailwindcss.com/docs/upgrading-to-v2#remove-future-and-experimental-configuration-options

web/themes/custom/opdavies/tailwind.config.js

@@ -100,11 +100,5 @@ module.exports = {
     borderWidth: [...variants.borderWidth, 'hover', 'focus'],
     margin: [...variants.margin, 'first', 'last', 'odd', 'even'],
     typography: ['responsive']
-  },
-  experimental: {
-    applyComplexClasses: true
-  },
-  future: {
-    purgeLayersByDefault: true
   }
 }