fix: make sticky TOC work for full scroll height and fix heading anchor links

app/public/assets/css/components/header.css

@@ -56,6 +56,9 @@ header nav ul a:hover {
 
 header nav ul a[aria-current="page"] {
   color: var(--accent-primary);
+  text-shadow:
+    0 0 4px white,
+    0 0 8px white;
   border-radius: 0;
   border-bottom: 2px solid currentColor;
   padding-bottom: 1px;