Fix redirect to community contributing page (#6570)

* Initial plan

* Fix redirect target for community/contributing/README.md

Changed 'community/contributing/README.md' to 'community/contributing.md' in the redirect configuration to match the actual file location. The file is at docs/community/contributing.md, not docs/community/contributing/README.md.

Co-authored-by: dprotaso <18562+dprotaso@users.noreply.github.com>

---------

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: dprotaso <18562+dprotaso@users.noreply.github.com>

Author: Copilot

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