add folders/templates sorting

app/views/icons/_arrow_sort.html.erb

@@ -0,0 +1,5 @@
+<svg xmlns="http://www.w3.org/2000/svg" class="<%= local_assigns[:class] %>" width="44" height="44" viewBox="0 0 24 24" stroke-width="1.5" stroke="#2c3e50" fill="none" stroke-linecap="round" stroke-linejoin="round">
+  <path stroke="none" d="M0 0h24v24H0z" fill="none" />
+  <path d="M3 9l4 -4l4 4m-4 -4v14" />
+  <path d="M21 15l-4 4l-4 -4m4 4v-14" />
+</svg>