Remove dirs from navigation tabs (#300) (#301)

Signed-off-by: acuadros95 <acuadros1995@gmail.com>
(cherry picked from commit b560387)

Co-authored-by: Antonio Cuadros <49162117+Acuadros95@users.noreply.github.com>

Author: mergify[bot]

rmw_microxrcedds_c/utils/doxygen/DoxygenLayout.xml

@@ -10,16 +10,15 @@
     </tab>
     <tab type="classes" visible="no" title="">
       <tab type="classlist" visible="no" title="" intro=""/>
-      <tab type="classindex" visible="no" title=""/> 
+      <tab type="classindex" visible="no" title=""/>
       <tab type="hierarchy" visible="no" title="" intro=""/>
       <tab type="classmembers" visible="no" title="" intro=""/>
     </tab>
     <tab type="files" visible="no" title="API reference">
       <tab type="filelist" visible="no" title="" intro=""/>
       <tab type="globals" visible="no" title="Functions" intro=""/>
     </tab>
-    <tab type="dirs" visible="no" title="" intro=""/>
-    <tab type="examples" visible="no" title="" intro=""/>  
+    <tab type="examples" visible="no" title="" intro=""/>
   </navindex>
 
    <!-- Layout definition for a group page -->