docs: remove WeChat group from English README section

README.md

@@ -389,16 +389,6 @@ For reCAPTCHA v3, `0.9` is not a "checkbox solved" result; it is the high-confid
 
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-<div align="center">
-  <table>
-    <tr>
-      <td align="center"><strong>WeChat Group 21</strong><br/><img src="assets/images/wechat_group21.jpg" alt="WeChat Group 21 QR" width="240"/></td>
-    </tr>
-  </table>
-</div>
-
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