Fix list route for responsive UI

Related to #359

Add a check to redirect to the homepage if the view is not mobile in the `src/pages/List.vue` file.

* Import `mobileMixin` in `src/pages/List.vue`.
* Add a `created` lifecycle hook to check if the view is mobile and redirect to `/dashboard` if not.

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src/pages/List.vue

@@ -6,11 +6,18 @@
 
 <script>
 import MonitorList from "../components/MonitorList.vue";
+import mobileMixin from "../mixins/mobile.js";
 
 export default {
     components: {
         MonitorList,
     },
+    mixins: [mobileMixin],
+    created() {
+        if (!this.isMobile) {
+            this.$router.push("/dashboard");
+        }
+    },
 };
 </script>