Added compatibility for mkdocs 0.17

src/assets/javascripts/application.js

@@ -225,7 +225,9 @@ function initialize(config) { // eslint-disable-line func-style
   new Material.Event.Listener("[data-md-component=query]", [
     "focus", "keyup", "change"
   ], new Material.Search.Result("[data-md-component=result]", () => {
-    return fetch(`${config.url.base}/mkdocs/search_index.json`, {
+    return fetch(`${config.url.base}/${
+      config.version < "0.17" ? "mkdocs" : "search"
+    }/search_index.json`, {
       credentials: "same-origin"
     }).then(response => response.json())
       .then(data => {