Add Cloudflare analytics to docs site

Author: drwpow

docs/src/layouts/MainLayout.astro

@@ -133,5 +133,6 @@ const nextLink: Record<string, Link | undefined> = {
         <RightSidebar headings={headings} githubEditUrl={githubEditUrl} />
       </aside>
     </main>
+    <script defer src="https://static.cloudflareinsights.com/beacon.min.js" data-cf-beacon='{"token": "8d756941072a4e108206714e34ad450b"}'></script>
   </body>
 </html>