New admin pages with better isolated functionality.

Draw winner page has:
 - Better user feedback
 - Knows how many wines are left
 - Separat button for starting sms prize distribution.
 - Edit, update and delete wine by id.
RegisterWinePage:
 - Import wine by url.
 - Edit, update and delete wine by id.

frontend/components/admin/PushPage.vue

@@ -0,0 +1,59 @@
+<template>
+  <div class="page-container">
+    <h1>Send push melding</h1>
+
+    <div class="notification-element">
+      <div class="label-div">
+        <label for="notification">Melding</label>
+        <textarea id="notification" type="text" rows="3" v-model="pushMessage" placeholder="Push meldingtekst" />
+      </div>
+      <div class="label-div">
+        <label for="notification-link">Push åpner lenke</label>
+        <input id="notification-link" type="text" v-model="pushLink" placeholder="Push-click link" />
+      </div>
+    </div>
+    <div class="button-container margin-top-sm">
+      <button class="vin-button" @click="sendPush">Send push</button>
+    </div>
+  </div>
+</template>
+
+<script>
+export default {
+  data() {
+    return {
+      pushMessage: "",
+      pushLink: "/"
+    };
+  },
+  methods: {
+    sendPush: async function() {
+      const options = {
+        method: "POST",
+        headers: {
+          "Content-Type": "application/json"
+        },
+        body: JSON.stringify({
+          message: this.pushMessage,
+          link: this.pushLink
+        })
+      };
+
+      return fetch("/subscription/send-notification", options)
+        .then(resp => resp.json())
+        .then(response => {
+          if (response.success) {
+            this.$toast.info({
+              title: "Sendt!"
+            });
+          } else {
+            this.$toast.error({
+              title: "Noe gikk galt!",
+              description: response.message
+            });
+          }
+        });
+    }
+  }
+};
+</script>