Use trailing / for sections in the site header

Just like `ls`.

assets/css/080_site_header.css

@@ -60,12 +60,10 @@
         padding: 0;
       }
 
-      li:not(:first-child)::before {
+      li::after {
         color: var(--color-nav-separator);
-        content: ":";
-        font-weight: bold;
+        content: "/";
         justify-content: center;
-        margin-inline-end: var(--spacing);
       }
     }
   }

layouts/partials/menu.html

@@ -41,11 +41,12 @@ Renders a menu for the given menu ID.
           {{- end }}
         {{- end -}}
       >{{ $name }}</a>
+      {{- "" -}}
       {{- with .Children }}
         <ul>
           {{- partial "inline/menu/walk.html" (dict "page" $page "menuEntries" .) }}
         </ul>
-      {{- end }}
+      {{- end -}}
     </li>
   {{- end }}
 {{- end }}