Use absolute path to link sysadm <-> devel docs

Related to T3907

docs/_templates/layout.html

@@ -33,7 +33,7 @@
   <hr />
 
   <ul>
-      <li class="toctree-l1"><a href="../sysadm/">System Administration</a></li>
+      <li class="toctree-l1"><a href="/sysadm/">System Administration</a></li>
   </ul>
 {%- endblock %}
 

sysadm/_templates/layout.html

@@ -16,6 +16,6 @@
   <hr />
 
   <ul>
-      <li class="toctree-l1"><a href="../devel/">Development Documentation</a></li>
+      <li class="toctree-l1"><a href="/devel/">Development Documentation</a></li>
   </ul>
 {%- endblock %}

[Phabricator Migration user]

Some references in the commit message have been migrated:

• T3907 is now #3907 (closed)