add footer and modify keep alive behavior

frontend/src/App.vue

@@ -2,10 +2,15 @@
   <v-app>
     <Navbar/>
     <v-content class="ma-3">
-      <keep-alive>
+      <keep-alive :exclude="/gene-detail.*/">
         <router-view></router-view>
       </keep-alive>
+
     </v-content>
+    <v-footer class="pa-3">
+      <v-spacer></v-spacer>
+      <div>Some footer (<span class="font-italic font-weight-light">hash latest commit</span>)</div>
+    </v-footer>
   </v-app>
 </template>