Add the auto-generated node catalog to the website's user manual (#3662)

* Generate the MVP node catalog in the manual (with some placeholders)

* Implement nearly the rest of everything

* Move to the tools directory and make it generate nicer default values

* Add category descriptions

* Organize file structure and improve type naming

* Improve book table of contents code

* Add collapsing chapter navigation to the book template

* Add to build workflow

* Clean up site structure

website/static/js/component/video-autoplay.js

@@ -0,0 +1,24 @@
+const VISIBILITY_COVERAGE_FRACTION = 0.25;
+
+window.addEventListener("DOMContentLoaded", () => {
+	const players = document.querySelectorAll("[data-auto-play]");
+	players.forEach((player) => {
+		if (!(player instanceof HTMLVideoElement)) return;
+
+		let loaded = false;
+
+		new IntersectionObserver(
+			(entries) => {
+				entries.forEach((entry) => {
+					if (!loaded && entry.intersectionRatio > VISIBILITY_COVERAGE_FRACTION) {
+						player.removeAttribute("preload");
+						player.setAttribute("autoplay", "");
+
+						loaded = true;
+					}
+				});
+			},
+			{ threshold: VISIBILITY_COVERAGE_FRACTION },
+		).observe(player);
+	});
+});