fix: hash locating of cjk heading isn't working (jeffreytse#44)

When the heading includes CJK (Chinese, Japanese, Korean)
characters, the hash locating isn't working correctly, the page
will not automatically scroll to the corresponding heading.

_includes/extensions/hashlocate.html

@@ -1,6 +1,7 @@
 <script>
   function hashLocate(hashValue) {
     hashValue = hashValue.replace(/^.*#h-/, '');
+    hashValue = decodeURIComponent(hashValue);
     var element = document.getElementById(hashValue);
 
     if (!element) {