Updated Quartery KPI number for wg from 18 to 20

Signed-off-by: Zhou Fang <zhou.fang@eclipse-foundation.org>

content/en_index.php

diff --git a/content/en_index.php b/content/en_index.php
index fdd6882..208d8c8 100644
--- a/content/en_index.php
+++ b/content/en_index.php
@@ -169,7 +169,7 @@
               <span class="featured-circle featured-circle-stats"><i data-feather="share-2" stroke-width="1"></i></span>
             </span>
             <span class="col-xs-12 featured-stats-text-container">
-              <span class="featured-stats-number">18</span><br>
+              <span class="featured-stats-number">20</span><br>
                Working Groups
             </span>
           </a>