[Enhancement] Hide sidebar on tablets (#358)

* [Enhancement] Hide sidebar on tablets

* Remove unnecessary console.log

* Use beforeDestroy

app/javascript/dashboard/components/SidemenuIcon.vue

@@ -0,0 +1,14 @@
+<template>
+  <i class="ion-android-menu hamburger--menu" @click="onMenuItemClick"></i>
+</template>
+
+<script>
+/* global bus */
+export default {
+  methods: {
+    onMenuItemClick() {
+      bus.$emit('sidemenu_icon_click');
+    },
+  },
+};
+</script>