feat: randomize greeting from pool on homepage

apps/vdn-static/src/utils/random.ts

@@ -0,0 +1,13 @@
+export function randomMaybeElement<Elements extends unknown[]>(
+	elements: Elements,
+): Elements[number] | undefined {
+	const index = Math.floor(Math.random() * elements.length);
+	return elements[index];
+}
+
+export function randomElement<Elements extends [unknown, ...unknown[]]>(
+	elements: Elements,
+): Elements[number] {
+	// SAFETY: because there is always at least one element, undefined will never be returned
+	return randomMaybeElement(elements) as Elements[number];
+}