QuizBar: add Discord URL

Author: usrbinsam

src/components/Toolbars/QuizBar.vue

@@ -53,10 +53,9 @@
  <v-list-item :to="{ name: 'faq' }">
  <v-list-item-title>Check The FAQ</v-list-item-title>
  </v-list-item>
- <!-- FIXME: uncomment this when we have a CodeChallenge discord
- <v-list-item href="https://discord.gg/NuKfKZ8" target="_blank">
+ <v-list-item href="https://discord.gg/NAufNzsJ8t" target="_blank">
  <v-list-item-title>Get Help On Discord</v-list-item-title>
- </v-list-item> -->
+ </v-list-item>
  <v-list-item
  href="https://www.facebook.com/events/212184353938197/"
  target="_blank"