typo: power to powered (#597)

Co-authored-by: John Niang <johnniang@fastmail.com>
Co-authored-by: Ryan Wang <i@ryanc.cc>

src/components/GlobalFooter/GlobalFooter.vue

@@ -1,7 +1,7 @@
 <template>
   <div class="footer text-center" style="padding: 0 16px; margin: 48px 0 0">
     <div class="copyright" style="color: rgba(0, 0, 0, 0.45); font-size: 14px">
-      Proudly power by
+      Powered by
       <router-link :to="{ name: 'About' }"> Halo </router-link>
     </div>
   </div>