Attribute joke API in about page

src/components/routes/About.vue

@@ -1,4 +1,6 @@
 <template lang="pug">
+- const JOKE_API_LINK = "https://github.com/15Dkatz/official_joke_api"
+
 section
   h2 About
 
@@ -11,4 +13,14 @@ section
   p
     | To make developing and building the project a breeze, the zero
     | configuration build tool parcel is used.
+  p
+    | The
+    RouterLink(to="/joke") joke page
+    | is made possible by the
+    | #[a(href=JOKE_API_LINK target="_blank") Official Joke API].
 </template>
+
+<style lang="sass" scoped>
+a
+  text-decoration: underline
+</style>