refactor(website): extract layouts and use more server components (#9027)

Closes https://github.com/discordjs/discord.js/issues/8920
Closes https://github.com/discordjs/discord.js/issues/8997

apps/website/src/app/docAPI.ts

@@ -0,0 +1,26 @@
+import { readFile } from 'node:fs/promises';
+import { join } from 'node:path';
+
+export async function fetchVersions(packageName: string): Promise<string[]> {
+	const response = await fetch(`https://docs.discordjs.dev/api/info?package=${packageName}`, {
+		next: { revalidate: 3_600 },
+	});
+
+	return response.json();
+}
+
+export async function fetchModelJSON(packageName: string, version: string): Promise<unknown> {
+	if (process.env.NEXT_PUBLIC_LOCAL_DEV) {
+		const res = await readFile(
+			join(process.cwd(), '..', '..', 'packages', packageName, 'docs', 'docs.api.json'),
+			'utf8',
+		);
+		return JSON.parse(res);
+	}
+
+	const response = await fetch(`https://docs.discordjs.dev/docs/${packageName}/${version}.api.json`, {
+		next: { revalidate: 3_600 },
+	});
+
+	return response.json();
+}