hide instance url/link/text in header using hideSitename option

src/components/mobile_nav/mobile_nav.js

@@ -29,6 +29,7 @@ const MobileNav = {
     unseenNotificationsCount () {
       return this.unseenNotifications.length
     },
+    hideSitename () { return this.$store.state.instance.hideSitename },
     sitename () { return this.$store.state.instance.name }
   },
   methods: {

src/components/mobile_nav/mobile_nav.vue

@@ -17,6 +17,7 @@
             <i class="button-icon icon-menu" />
           </a>
           <router-link
+            v-if="!hideSitename"
             class="site-name"
             :to="{ name: 'root' }"
             active-class="home"