Front stack primary updates and improvements (#757)

* (fix) index.html formating for prettier

* (add) proper icon management
- on-demand icons auto importing
- handle all available icon sets (https://icones.js.org)

* (fix) proper css management

* (add) front stack improvement:
- implement vue router
- prepare for App.vue simplification
- proper management of views and layouts
- fix Tailwind CSS and prepare for overall css cleaning

* (fix) move back user.css to public dir

* (fix) remove user.css import from main.ts

src/router.ts

@@ -0,0 +1,28 @@
+import { createRouter, createWebHistory } from 'vue-router'
+import LayoutDefault from '@/views/layouts/LayoutDefault.vue'
+
+const router = createRouter({
+  history: createWebHistory(),
+  routes: [
+    {
+      path: '/',
+      component: LayoutDefault,
+      children: [
+        {
+          path: '',
+          component: () => import('@/views/GraphView.vue')
+        }
+      ]
+    }
+  ],
+
+  scrollBehavior(to, from, savedPosition) {
+    if (savedPosition) {
+      return savedPosition
+    } else {
+      return { top: 0 }
+    }
+  }
+})
+
+export default router