ci: adopt reusable workflows from `named-data/actions`

Switch source archive (tarball) to xz compression and
mention using gerrit for code review in the README

Change-Id: Ie69de065311737f6fe48976fbab5f896f3960e06
diff --git a/docs/named_data_theme/named_data_header.html b/docs/named_data_theme/named_data_header.html
index 5bf7d1c..ebbe180 100644
--- a/docs/named_data_theme/named_data_header.html
+++ b/docs/named_data_theme/named_data_header.html
@@ -32,7 +32,7 @@
 
          <!--top menu-->
          <div class="nine columns" id="menu_container" >
-           <h1><a href="https://named-data.net/doc/PSync/$projectnumber/">$projectname $projectnumber documentation</a></h1>
+           <h1><a href="https://docs.named-data.net/PSync/$projectnumber/">$projectname $projectnumber documentation</a></h1>
          </div>
     </div>
 </div><!--header container end-->