Add visual button presets, jump targets and menu controls

public/assets/site.css

@@ -373,3 +373,5 @@ body.consent-open .scroll-top{display:none}
     .zoom-close,.zoom-prev,.zoom-next{width:46px;height:46px}
     .zoom-prev{left:8px}.zoom-next{right:8px}
 }
+
+.has-anchor{position:relative}.block-anchor{position:absolute;top:0;left:0;width:1px;height:1px;pointer-events:none;scroll-margin-top:110px}.nav-label{display:inline-flex;align-items:center;gap:.5em}.nav-label>.block-icon{width:1.1em;height:1.1em;color:inherit;flex:none}