Fix broken redirect for contributing documentation

Author: jijo-OO7

config/redirects.yml

@@ -1,7 +1,7 @@
 plugins:
   redirects:
     redirect_maps:
-      versioned/contributing/about.md: community/contributing/README.md
+      versioned/contributing/about.md: community/contributing.md
       versioned/eventing/experimental-features/README.md: versioned/eventing/features/README.md
       versioned/eventing/experimental-features/delivery-timeout.md: versioned/eventing/features/delivery-timeout.md
       versioned/eventing/experimental-features/delivery-retryafter.md: versioned/eventing/features/delivery-retryafter.md