Consistent burger icon

partials/components/navigation.hbs

@@ -10,7 +10,10 @@
                 {{/if}}
             </a>
             {{> "search-toggle"}}
-            <button class="gh-burger"></button>
+            <button class="gh-burger gh-icon-button">
+                {{> "icons/burger"}}
+                {{> "icons/close"}}
+            </button>
         </div>
 
         <nav class="gh-navigation-menu">

partials/icons/burger.hbs

@@ -0,0 +1 @@
+<svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" fill="currentColor" viewBox="0 0 256 256"><path d="M224,128a8,8,0,0,1-8,8H40a8,8,0,0,1,0-16H216A8,8,0,0,1,224,128ZM40,72H216a8,8,0,0,0,0-16H40a8,8,0,0,0,0,16ZM216,184H40a8,8,0,0,0,0,16H216a8,8,0,0,0,0-16Z"></path></svg>

partials/icons/close.hbs

@@ -0,0 +1 @@
+<svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" fill="currentColor" viewBox="0 0 256 256"><path d="M205.66,194.34a8,8,0,0,1-11.32,11.32L128,139.31,61.66,205.66a8,8,0,0,1-11.32-11.32L116.69,128,50.34,61.66A8,8,0,0,1,61.66,50.34L128,116.69l66.34-66.35a8,8,0,0,1,11.32,11.32L139.31,128Z"></path></svg>