autofocus downloads search and exclude .idea directory

_config.yml

@@ -61,3 +61,4 @@ exclude:
   - icon.png
   - template.md
   - Rakefile
+  - .idea

assets/javascript/downloads.js

@@ -441,3 +441,7 @@ function appendFilterTag(type, name) {
 function removeFilterTag(type, name) {
   document.querySelector("[data-type='" + type + "'][data-name='" + name + "']").parentNode.remove();
 }
+
+window.addEventListener('load', function () {
+    document.querySelector("#search").focus();
+});