Add proper view segregation

src/main/resources/templates/admin.html

@@ -20,13 +20,8 @@
     </header>
     <section class="controls">
         <div>
-            <h3>Admins</h3>
-            <input id="new-admin" placeholder="Twitch username" />
-            <button onclick="addAdmin()">Add admin</button>
-            <ul id="admin-list"></ul>
-        </div>
-        <div>
-            <h3>Assets</h3>
+            <h3>Overlay assets</h3>
+            <p>Upload images to place on the broadcaster's overlay. Changes are visible to the broadcaster instantly.</p>
             <input id="asset-file" type="file" accept="image/*" />
             <button onclick="uploadAsset()">Upload</button>
             <ul id="asset-list"></ul>