Update README.md

Author: phre1

README.md

@@ -133,8 +133,8 @@ And then in your App.vue file:
   @import '~@ditdot-dev/vue-flow-form/dist/vue-flow-form.css';
   /* Import one of the Vue Flow Form CSS themes (optional) */
   @import '~@ditdot-dev/vue-flow-form/dist/vue-flow-form.theme-minimal.css';
-  @import '~@ditdot-dev/vue-flow-form/dist/vue-flow-form.theme-green.css';
-  @import '~@ditdot-dev/vue-flow-form/dist/vue-flow-form.theme-purple.css';
+  /* @import '~@ditdot-dev/vue-flow-form/dist/vue-flow-form.theme-green.css'; */
+  /* @import '~@ditdot-dev/vue-flow-form/dist/vue-flow-form.theme-purple.css'; */
 </style>
 ```