Add Vercel Analytics via client plugin; use Yarn lockfile and remove npm lockfile

plugins/vercel-analytics.client.ts

@@ -0,0 +1,17 @@
+export default defineNuxtPlugin(() => {
+  if (import.meta.env.PROD) {
+    import('@vercel/analytics')
+      .then(({ inject }) => {
+        try {
+          inject();
+        } catch {
+          // ignore
+        }
+      })
+      .catch(() => {
+        // ignore
+      });
+  }
+});
+
+