Add avatar to admin user page

app/views/admin/users/show.html.erb

@@ -89,14 +89,42 @@
     </section>
 
     <section class="sm:flex-1 sm:pt-0">
-      <h3>LDAP</h3>
+      <h3>Avatar</h3>
+      <% if @user.avatar.attached? %>
+      <table class="divided">
+        <tbody>
+          <tr>
+            <th class="align-top">Image</th>
+            <td class="align-top">
+              <%= image_tag image_url_for(@user.avatar), class: "h-20 w-20 rounded-lg" %>
+            </td>
+          </tr>
+          <tr>
+            <th>Content type</th>
+            <td>
+              <%= @user.avatar.content_type %>
+            </td>
+          </tr>
+          <tr>
+            <th>Size</th>
+            <td>
+              <%= number_to_human_size(@user.avatar.blob.byte_size) %>
+            </td>
+          </tr>
+        </tbody>
+      </table>
+      <% else %>
+      <p class="text-gray-500">No avatar uploaded</p>
+      <% end %>
+
+      <h3 class="mt-12">LDAP</h3>
       <table class="divided">
         <tbody>
           <tr>
             <th>Avatar</th>
             <td>
               <% if @ldap_avatar.present? %>
-                JPEG size: <%= @ldap_avatar.size %>
+                JPEG size: <%= number_to_human_size(@ldap_avatar.size) %>
               <% else %>
                 &mdash;
               <% end %>