docs: update contributing guide reference

Update link from contributing-a-language.md to contributing.md.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: matthew-on-git

README.md

@@ -93,7 +93,7 @@ This hook requires no configuration. Types and scopes are enforced globally per
 
 See [DEVELOPMENT.md](DEVELOPMENT.md) for development setup and contribution guidelines.
 
-To add a new language ecosystem to DevRail, see the [Contributing a New Language Ecosystem](https://github.com/devrail-dev/devrail-standards/blob/main/standards/contributing-a-language.md) guide.
+To add a new language ecosystem to DevRail, see the [Contributing to DevRail](https://github.com/devrail-dev/devrail-standards/blob/main/standards/contributing.md) guide.
 
 ## License