website: Remove W3C validator button.

murraycu · murraycu · commit 56bf89d2f3a6 · 2018-03-10T15:07:44.000+01:00
diff --git a/docs/_layouts/default.html b/docs/_layouts/default.html
@@ -41,10 +41,6 @@ <h1>{{page.title}}</h1>
       <a href="mailto:libsigc-list@gnome.org">libsigc++ mailing list</a>
       |
       <a href="https://github.com/GNOME/libsigcplusplus/tree/master/docs">website source</a>
-      |
-      <a href="http://validator.w3.org/check/referer"><img
-         src="http://validator.w3.org/images/vxhtml11"
-         alt="Valid XHTML 1.0!" height="31" width="88" border="0" /></a>
     </div>
   </body>
 </html>
