Add configuration for sharing emoji packs

This adds the configuration interface for the endpoints introduced here.

src/views/emoji-packs/components/EmojiPack.vue

@@ -32,7 +32,7 @@
       <el-collapse-item :name="name" title="Show pack contents">
         <new-emoji-uploader v-if="isLocal" :pack-name="name" class="new-emoji-uploader" />
 
-        <b>Manage existing emoji</b>
+        <h4>Manage existing emoji</h4>
 
         <single-emoji-editor
           v-for="(file, ename) in pack.files"