refactor: migrate from Vuex to Pinia

src/main.js

@@ -1,7 +1,8 @@
 import { createApp } from 'vue'
+import { createPinia } from 'pinia'
+
 import App from './App.vue'
 import router from './router'
-import store from './store'
 
 import CoreuiVue from '@coreui/vue'
 import CIcon from '@coreui/icons-vue'
@@ -9,7 +10,7 @@ import { iconsSet as icons } from '@/assets/icons'
 import DocsExample from '@/components/DocsExample'
 
 const app = createApp(App)
-app.use(store)
+app.use(createPinia())
 app.use(router)
 app.use(CoreuiVue)
 app.provide('icons', icons)