refactor: move website files to the root level

assets/tailwindcss/colours.cjs

@@ -0,0 +1,13 @@
+let colours = require('tailwindcss/colors')
+
+module.exports = {
+  black: '#000',
+  blue: {
+    primary: '#24608A',
+  },
+  current: 'currentColor',
+  grey: colours.stone,
+  inherit: 'inherit',
+  transparent: 'transparent',
+  white: '#fff'
+}