chore: update link

docs/cli/build.md

@@ -13,5 +13,5 @@ jtd-codebuild <path>
 - `<path>`: The path that contains `jtd-codebuild.json` file. If this is not provided, the current directory is used. See [Quick Example][quick-example] or [Configuration] for how to write `jtd-codebuild.json`.
 
 [quick-example]: ../../README.md#quick-example
-[Configuration]: ../codegen/config/index.md
+[Configuration]: ../codegen/config/project.md