Update Open Graph and Twitter image links for PyCon Cameroon 2026

Signed-off-by: Steve Yonkeu <yokwejuste@yahoo.com>

Author: yokwejuste

index.html

@@ -21,7 +21,7 @@
   <meta property="og:title" content="PyCon Cameroon 2026 | Cameroon's Premier Python Conference">
   <meta property="og:description"
     content="Join PyCon Cameroon 2026, September 17-19 in Yaoundé. Cameroon's premier Python conference featuring inspiring talks, hands-on workshops, and networking.">
-  <meta property="og:image" content="https://cm.pycon.org/images/branding/preview.jpg">
+  <meta property="og:image" content="https://dev-to-uploads.s3.amazonaws.com/uploads/articles/z1cwq558qdzf0x8o8uuv.jpg">
   <meta property="og:image:type" content="image/jpeg">
   <meta property="og:image:width" content="1200">
   <meta property="og:image:height" content="630">
@@ -33,7 +33,7 @@
   <meta name="twitter:title" content="PyCon Cameroon 2026 | Cameroon's Premier Python Conference">
   <meta name="twitter:description"
     content="Join PyCon Cameroon 2026, September 17-19 in Yaoundé. Cameroon's premier Python conference featuring inspiring talks, hands-on workshops, and networking.">
-  <meta name="twitter:image" content="https://cm.pycon.org/images/branding/preview.jpg">
+  <meta name="twitter:image" content="https://dev-to-uploads.s3.amazonaws.com/uploads/articles/z1cwq558qdzf0x8o8uuv.jpg">
   <meta name="twitter:site" content="@PythonCameroon">
 
   <!-- Fonts -->