Remove purple letter on Topic list

It wasn't clear to me what it meant when I saw it. Since it is not some
kind of code to help idenfity a certain category of topic, I think it is
best to remove it to avoid confusion and leave more space for the title.

Author: Oli0li

app/views/topics/_list.html.erb

@@ -4,14 +4,9 @@
       <tr style="border-bottom: 1px solid #f1f5f9; transition: all 0.2s;" onmouseover="this.style.backgroundColor='#f8fafc'" onmouseout="this.style.backgroundColor='white'">
         <!-- Title -->
         <td style="padding: 1.25rem 1.5rem;">
-          <div style="display: flex; align-items: center; gap: 0.75rem;">
-            <div style="width: 2.25rem; height: 2.25rem; background: linear-gradient(135deg, #7c3aed 0%, #5b21b6 100%); border-radius: 0.5rem; display: flex; align-items: center; justify-content: center; color: white; font-weight: 600; font-size: 0.875rem;">
-              <%= topic.title.first.upcase %>
-            </div>
-            <div>
-              <div style="font-weight: 600; color: #111827; font-size: 0.95rem;"><%= topic.title %></div>
-              <div style="color: #6b7280; font-size: 0.75rem;">Published <%= topic.published_at&.strftime('%b %d, %Y') %></div>
-            </div>
+          <div style="display: flex; flex-direction: column; align-items: center; gap: 0.25rem;">
+            <div style="font-weight: 600; color: #111827; font-size: 0.95rem;"><%= topic.title %></div>
+            <div style="color: #6b7280; font-size: 0.75rem;">Published <%= topic.published_at&.strftime('%b %d, %Y') %></div>
           </div>
         </td>