refactor: rewrite user profile store using pinia

app/src/main.ts

@@ -1,4 +1,6 @@
 import { createApp } from 'vue'
+import { createPinia } from 'pinia'
+
 import './style.css'
 /* import font awesome icon component */
 import { FontAwesomeIcon } from '@fortawesome/vue-fontawesome'
@@ -13,9 +15,11 @@ import App from './App.vue'
 import router from './router'
 
 const app = createApp(App)
+const pinia = createPinia()
 
 app.component('font-awesome-icon', FontAwesomeIcon)
 
+app.use(pinia)
 app.use(router)
 
 const options = {