exit search screen with Esc key (#2055)

* exit search with esc key feature is added
* closing search screen with esc key feature is added to _main.js

assets/js/_main.js

@@ -43,6 +43,16 @@ $(document).ready(function() {
     $(".author__urls-wrapper button").toggleClass("open");
   });
 
+  // Close search screen with Esc key
+  $(document).keyup(function(e) {
+    if (e.keyCode === 27) {
+      if ($(".initial-content").hasClass("is--hidden")) {
+        $(".search-content").toggleClass("is--visible");
+        $(".initial-content").toggleClass("is--hidden");
+      }
+    }
+  });
+
   // Search toggle
   $(".search__toggle").on("click", function() {
     $(".search-content").toggleClass("is--visible");