fix: prevent invalid contributor footer markup (#2608)

Disable the all-contributors usage footer because the pinned CLI emits an invalid closing img tag. Keep the usage link outside the generated contributor block.

Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>

Copilot-Session: 936cc10e-06f7-440c-96e7-51d1e94476ce

README.md

@@ -546,15 +546,6 @@ Thanks goes to these wonderful people ([emoji key](./CONTRIBUTING.md#contributor
       <td align="center" valign="top" width="14.28%"><a href="https://surenk.com"><img src="https://avatars.githubusercontent.com/u/902972?v=4" width="100px;" alt=""/><br /><sub><b>Suren K</b></sub></a></td>
     </tr>
   </tbody>
-  <tfoot>
-    <tr>
-      <td align="center" size="13px" colspan="7">
-        <img src="https://raw.githubusercontent.com/all-contributors/all-contributors-cli/1b8533af435da9854653492b1327a23a4dbd0a10/assets/logo-small.svg">
-          <a href="https://all-contributors.js.org/docs/en/bot/usage">Add your contributions</a>
-        </img>
-      </td>
-    </tr>
-  </tfoot>
 </table>
 
 <!-- markdownlint-restore -->
@@ -562,6 +553,8 @@ Thanks goes to these wonderful people ([emoji key](./CONTRIBUTING.md#contributor
 
 <!-- ALL-CONTRIBUTORS-LIST:END -->
 
+<p><a href="https://all-contributors.js.org/docs/en/bot/usage">Add your contributions</a></p>
+
 This project follows the [all-contributors](https://github.com/all-contributors/all-contributors) specification. Contributions of any kind welcome!
 
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