fix: home link '/' shouldn’t always stays active (#47)

Author: dyhpoon

lib/default-theme/NavLinks.vue

@@ -3,7 +3,8 @@
     <!-- user links -->
     <router-link v-for="item in userLinks"
       :to="item.link"
-      :key="item.link">
+      :key="item.link"
+      :exact="item.link === '/'">
       {{ item.text }}
     </router-link>
     <!-- github link -->