Refactor WebSocket handling and remove nuxt-visitors module

Replaced nuxt-visitors module with a custom WebSocket implementation for location tracking. Removed redundant code and comments in `useVisitors` composable and introduced the `location.server` plugin to manage user location. Updated dependencies and configurations to reflect these changes, streamlining the approach.

app/plugins/location.server.ts

@@ -0,0 +1,11 @@
+export default defineNuxtPlugin(() => {
+  const event = useRequestEvent()
+  console.log('event', event)
+
+  useState('location', () => ({
+    latitude: event?.context.cf?.latitude || Math.random() * 180 - 90, // default to random latitude (only in dev)
+    longitude: event?.context.cf?.longitude || Math.random() * 360 - 180, // default to random longitude (only in dev)
+  }))
+
+  console.log(useState('location').value)
+})