Add search icon from local src

css/documentation.css

@@ -336,6 +336,7 @@ color: #F04124;
     border: 0;
     text-indent: -9999px;
     background-color: transparent;
+    background-image: url("/images/search-icon.png");
     /* background-size: 38px 38px; */
     background-repeat: no-repeat;
     background-position: center center;