Rename frontend dir, update README.

frontend/src/router/index.ts

@@ -0,0 +1,15 @@
+import { createRouter, createWebHashHistory } from 'vue-router'
+import ExplorerView from '@/views/ExplorerView.vue'
+
+const router = createRouter({
+  history: createWebHashHistory(import.meta.env.BASE_URL),
+  routes: [
+    {
+      path: '/:pathMatch(.*)*',
+      name: 'explorer',
+      component: ExplorerView
+    }
+  ]
+})
+
+export default router