🚚: move files for VueJS good practices compliance

see https://vuejs.org/v2/style-guide/#Tightly-coupled-component-names-strongly-recommended for Objective and Timer
see https://vuejs.org/v2/style-guide/#Single-instance-component-names-strongly-recommended for TheSelector

src/components/Battleground.vue

@@ -36,8 +36,8 @@
 
 <script>
   import BATTLEGROUNDS from '@/gameInfos/battlegrounds'
-  import Timer from '@/components/Battleground/Timer'
-  import Objective from '@/components/Battleground/Objective'
+  import Timer from '@/components/Timer'
+  import Objective from '@/components/Objective'
 
   export default {
     name: 'Battleground',

src/components/Battleground/Objective.vue → src/components/Objective.vue

@@ -25,7 +25,7 @@
 </style>
 
 <script>
-  import Timer from '@/components/Battleground/Timer'
+  import Timer from '@/components/Timer'
   export default {
     name: 'Objective',
     props: {

src/router/index.js

@@ -2,7 +2,7 @@ import Vue from 'vue'
 import Router from 'vue-router'
 
 import Hello from '@/components/Hello'
-import BattlegroundSelector from '@/components/BattlegroundSelector'
+import TheBattlegroundSelector from '@/components/TheBattlegroundSelector'
 import Battleground from '@/components/Battleground'
 
 Vue.use(Router)
@@ -16,7 +16,7 @@ export default new Router({
     },
     {
       path: '/battlegrounds',
-      component: BattlegroundSelector
+      component: TheBattlegroundSelector
     },
     {
       path: '/battleground/:battlegroundId',