Remove 'koon2120.com' from index.html (#329)

Removed the entry for 'koon2120.com' from the list.

Author: koon2120

index.html

@@ -337,9 +337,6 @@ <h1>
         <li data-lang="th" id="mon.in.th" data-owner="jarmonxd">
           <a href="https://mon.in.th">mon.in.th</a>
         </li>
-        <li data-lang="th" id="koon2120.com" data-owner="koon2120">
-          <a href="https://koon2120.com">koon2120.com</a>
-        </li>
         <li data-lang="th" id="pokpong.net" data-owner="pokpong007" data-feed="https://pokpong.net/feed.xml">
           <a href="https://pokpong.net">pokpong.net</a>
         </li>