Add 'examples' ID to 開催例 section

Author: yasulab

index.html

@@ -214,7 +214,7 @@ <h3 class="headline rich_font" style='margin-top: 70px;'>CoderDojo とは？</h3
       <div id="index_content2">
 	<div class="index_content1">
 	  <div class="index_content_header3" style='margin-top: 80px; margin-bottom: 60px;'>
-	    <h3 class="headline rich_font">DecaDojo 開催例</h3>
+	    <h3 id='examples' class="headline rich_font">DecaDojo 開催例</h3>
           </div>
 
 	  {% for event in site.data.events %}