⚡ Adds Web Componens page into the doc and doc enhancements (#21)

docs_src/components/examples/introducing/3ps.js

@@ -0,0 +1,6 @@
+// pseudo code!
+const onchage=
+	event=>
+		console.log("Reacting to the:", event); // A
+input.addEventListener("change", onchange); // B
+input.dispatchEvent(new Event("change")); // C

docs_src/components/examples/introducing/helloWorld.js

@@ -0,0 +1,15 @@
+import { el } from "deka-dom-el";
+import { S } from "deka-dom-el/signals";
+const clicks= S(0); // A
+document.body.append(
+	el().append(
+		el("p", S(()=>
+			"Hello World "+"🎉".repeat(clicks()) // B
+		)),
+		el("button", {
+			type: "button",
+			onclick: ()=> clicks(clicks()+1), // C
+			textContent: "Fire",
+		})
+	)
+);