[Enhancement] Hide sidebar on tablets (#358)

* [Enhancement] Hide sidebar on tablets

* Remove unnecessary console.log

* Use beforeDestroy

app/javascript/dashboard/assets/scss/widgets/_conversation-view.scss

@@ -3,9 +3,14 @@
   flex-direction: column;
 
   .chat-list__top {
+    @include flex;
     @include padding($space-normal $zero $space-small $zero);
+
+    align-items: center;
+    justify-content: space-between;
+
     .page-title {
-      float: left;
+      @include flex;
       margin-bottom: $zero;
       margin-left: $space-normal;
     }

app/javascript/dashboard/assets/scss/widgets/_sidemenu.scss

@@ -126,3 +126,22 @@
     margin-top: auto;
   }
 }
+
+.hamburger--menu {
+  cursor: pointer;
+  display: none;
+  margin-right: $space-normal;
+
+  @media screen and (max-width: 1200px){
+    display: block;
+  }
+}
+
+.header--icon {
+  display: block;
+  margin-right: $space-normal;
+
+  @media screen and (max-width: 1200px){
+    display: none;
+  }
+}