Readded a few tabs

I added a few tabs to the html manual:
Getting Started
Tutorials
Index of Actions

user-doc/go-doxygen

@@ -35,6 +35,9 @@ awk -v version=$(plumed info --version) '{
     sub("Page","(v"version")",$0);
     print
   } else if(match($0,"<span>Related&#160;Pages</span>")){
+    print "      <li><a href=\"_syntax.html\"><span>Getting&#160;started</span></a></li>"
+    print "      <li><a href=\"tutorials.html\"><span>Tutorials</span></a></li>"
+    print "      <li><a href=\"glossary.html\"><span>Index&#160;of&#160;Actions</span></a></li>"
   } else print
 }' $file > $file.tmp
 mv $file.tmp $file