doc/css: no outline for a[name]

I'd however prefer to have them in the h1 tag. Or even around the h1,
that's legal since HTML5. Or, best variant: an id on the element. A
common prefix, and no worries about duplicates: we never show content
in multiple columns.

modules/doc/public/css/module.less

@@ -25,6 +25,10 @@ table {
   width: 100%;
 }
 
+a[name]:focus {
+  outline: 0;
+}
+
 th, td {
   padding: 0.25rem;
   text-align: left;