color fix (microsoft#7081)

Co-authored-by: Pankaj Bhojwani <pabhojwa@microsoft.com>

Author: PankajBhojwani

source/nodejs/adaptivecards-site/themes/adaptivecards/source/css/style.css

@@ -682,7 +682,7 @@ button .fa-check {
 }
 
 .ac-footer-link-no-chevron{
-  color: #0b78d0!important;  
+  color: #0c70c3!important;  
 }
 
 .ac-footer .post-subtitle {