rework more courseware sidebar links to actual anchors, fixes #953

Closes #953

resources/vue/components/courseware/CoursewareAdminActionWidget.vue

 <template>
     <ul class="widget-list widget-links cw-action-widget">
-        <li v-if="templatesView" class="cw-action-widget-add" @click="addTemplate">
-            <translate>Vorlage hinzufügen</translate>
+        <li v-if="templatesView" class="cw-action-widget-add">
+            <a href="#"  @click.prevent="addTemplate">
+                <translate>Vorlage hinzufügen</translate>
+            </a>
         </li>
     </ul>
 </template>
@@ -27,4 +29,4 @@ export default {
         }
     }
 }
-</script>
+</script>
\ No newline at end of file

resources/vue/components/courseware/CoursewareAdminViewWidget.vue

 <template>
   <ul class="widget-list widget-links sidebar-views cw-view-widget">
-        <li
-            :class="{ active: templatesView }"
-            @click="setTemplatesView"
-        >
-            <translate>Vorlagen</translate>
+        <li :class="{ active: templatesView }">
+            <a href="#" @click.prevent="setTemplatesView">
+                <translate>Vorlagen</translate>
+            </a>
         </li>
   </ul>
 </template>
@@ -28,4 +27,4 @@ export default {
     }
 
 }
-</script>
+</script>
\ No newline at end of file

resources/vue/components/courseware/CoursewareContentOverviewActionWidget.vue

 <template>
     <ul class="widget-list widget-links cw-action-widget">
-        <li class="cw-action-widget-add" @click="addElement">
-            <translate>Neues Lernmaterial anlegen</translate>
+        <li class="cw-action-widget-add" >
+            <a href="#" @click.prevent="addElement">
+                <translate>Neues Lernmaterial anlegen</translate>
+            </a>
         </li>
     </ul>
 </template>

resources/vue/components/courseware/CoursewareDashboardViewWidget.vue

 <template>
     <ul class="widget-list widget-links sidebar-views cw-view-widget">
-        <li
-            :class="{ active: defaultView }"
-            @click="setDefaultView"
-        >
-            <translate>Standard</translate>
+        <li :class="{ active: defaultView }">
+            <a href="#" @click.prevent="setDefaultView">
+                <translate>Standard</translate>
+            </a>
         </li>
-        <li
-            :class="{ active: taskView }"
-            @click="setTaskView"
-        >
-            <translate>Aufgaben</translate>
+        <li :class="{ active: taskView }">
+            <a href="#" @click.prevent="setTaskView">
+                <translate>Aufgaben</translate>
+            </a>
         </li>
-        <li 
-            :class="{ active: activityView }"
-            @click="setActivityView"
-        >
-            <translate>Aktivitäten</translate>
+        <li :class="{ active: activityView }">
+            <a href="#" @click.prevent="setActivityView">
+                <translate>Aktivitäten</translate>
+            </a>
         </li>
     </ul>
 </template>