Change: hide frontpage channel descriptions

* Discussion here: https://koodiklinikka.slack.com/archives/C6P893LFK/p1677587646981509
* tl;dr: Hiding the channel topics as those cannot really be controlled or made sure to be representative on the website
* Change the stylings to accommodate this
* Note that it seems to me at least that the channels are fetched and populated during build time, not in runtime, and thus the data is effectively stale (more in the linked thread), and this does nothing to fix that

pages/index.tsx

@@ -130,18 +130,10 @@ const IndexContent = (props: IndexProps) => (
                             #{channel.name}
                           </a>
                         </div>
-                        <span className="channel-members">
-                          {channel.num_members} jäsentä
-                        </span>
                       </td>
                       <td>
-                        <span>
-                          <ReactMarkdown
-                            className="channel-topic"
-                            components={{ p: ChannelReferenceRenderer }}
-                          >
-                            {channel.topic}
-                          </ReactMarkdown>
+                        <span className="channel-members">
+                          {channel.num_members} jäsentä
                         </span>
                       </td>
                     </tr>

styles/style.scss

@@ -533,7 +533,6 @@ footer {
   }
 }
 .channels {
-  width: 100%;
   list-style: none;
   padding: 0;
   td {
@@ -583,6 +582,7 @@ footer {
 }
 .channel-members {
   font-size: 12px;
+  margin-left: 1rem;
 }
 .channel-topic {
   p {