docs/website/index.html: refer to Gitlab and lore

Our index.html page still points to git.buildroot.net as the Git
repository, and to the defunct gmane for the mailing list
activity. Fix these by pointing to Gitlab and lore respectively.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

docs/website/index.html

@@ -133,14 +133,14 @@
   <div class="row">
     <div class="col-sm-6">
       <div class="panel panel-primary">
-	<div class="panel-heading"><a href="http://git.buildroot.net/buildroot"><h5>Recent commits</h5></a></div>
+	<div class="panel-heading"><a href="https://gitlab.com/buildroot.org/buildroot/"><h5>Recent commits</h5></a></div>
 	<div class="panel-box panel-body ellipsis" id="commit-activity">
 	</div>
       </div>
     </div>
     <div class="col-sm-6" >
       <div class="panel panel-primary">
-	<div class="panel-heading"><a href="http://dir.gmane.org/gmane.comp.lib.uclibc.buildroot"><h5>Recent discussions</h5></a></div>
+	<div class="panel-heading"><a href="https://lore.kernel.org/buildroot/"><h5>Recent discussions</h5></a></div>
 	<div class="panel-box panel-body ellipsis" id="mailing-list-activity">
 	</div>
       </div>