remove undo buttons from ui

_includes/vue-rule-script.html

@@ -8,8 +8,6 @@
         >
             <div class="controls">
                 <vue-button class="primary is-large" @click="clickPreview" :icon="icons.view">Preview</vue-button>
-                <vue-button class="is-large" v-if="this.canUndo()" @click="this.handleUndo" :icon="icons.undo">Undo</vue-button>
-                <vue-button class="is-large" v-if="this.canRedo()" @click="this.handleRedo" :icon="icons.redo">Redo</vue-button>
             </div>
             <div class="details">
                 <div class="label-group">