Delete merch page [fixes #12039] (#12094)

* delete merch.vue and all mentions of links to merch page

* Added comments about why merch page is being deleted

Co-authored-by: Kareen <kareenf@umich.edu>

website/client/src/components/appFooter.vue

@@ -49,11 +49,13 @@
                 target="_blank"
               >{{ $t('oldNews') }}</a>
             </li>
+            <!-- Commenting out merch page see https://github.com/HabitRPG/habitica/issues/12039
             <li>
               <router-link to="/static/merch">
                 {{ $t('merch') }}
               </router-link>
             </li>
+            -->
             <li>
               <router-link to="/static/press-kit">
                 {{ $t('presskit') }}