Doc: Add image headers.

doc/header.html

@@ -25,6 +25,23 @@
     DoxygenAwesomeParagraphLink.init()
     DoxygenAwesomeInteractiveToc.init()
     DoxygenAwesomeTabs.init()
+
+    window.addEventListener('DOMContentLoaded', function () {
+      document.querySelectorAll(".headertitle").forEach(div => {
+        if (div.textContent != "Getting Started" &&
+            div.textContent != "Installation" &&
+            div.textContent != "Modules" &&
+            true) {
+          return;
+        }
+        div.style.display = "none";
+        const img = document.querySelector("img.inline");
+        img.style.transition = "all 1.0s ease-in-out";
+        img.style.maxHeight = "40vh";
+        img.style.maxWidth = "100%";
+        img.style.objectFit = "contain";
+      });
+    });
 </script>
 $treeview
 $search