Fix broken reference links in site.xml for Maven 4.x (#11617)

The Reference menu links were using incorrect paths (impl/ and compat/)
instead of the deployed site structure (maven-impl-modules/ and
maven-compat-modules/), causing 404 errors on the production site.

Fixed URLs:
- Lifecycles: ./maven-impl-modules/maven-core/lifecycles.html
- Plugin Bindings: ./maven-impl-modules/maven-core/default-bindings.html
- Artifact Handlers: ./maven-impl-modules/maven-core/artifact-handlers.html
- CLI options: ./maven-compat-modules/maven-embedder/cli.html
- Super POM: ./maven-compat-modules/maven-model-builder/super-pom.html

Author: achyuth8055

src/site/site.xml

@@ -59,11 +59,11 @@ under the License.
     </menu>
 
     <menu inherit="bottom" name="Reference">
-      <item name="Lifecycles" href="./impl/maven-core/lifecycles.html"/>
-      <item name="Plugin Bindings to Default Lifecycle" href="./impl/maven-core/default-bindings.html"/>
-      <item name="Artifact Handlers" href="./impl/maven-core/artifact-handlers.html"/>
-      <item name="CLI options" href="./compat/maven-embedder/cli.html"/>
-      <item name="Super POM" href="./compat/maven-model-builder/super-pom.html"/>
+      <item name="Lifecycles" href="./maven-impl-modules/maven-core/lifecycles.html"/>
+      <item name="Plugin Bindings to Default Lifecycle" href="./maven-impl-modules/maven-core/default-bindings.html"/>
+      <item name="Artifact Handlers" href="./maven-impl-modules/maven-core/artifact-handlers.html"/>
+      <item name="CLI options" href="./maven-compat-modules/maven-embedder/cli.html"/>
+      <item name="Super POM" href="./maven-compat-modules/maven-model-builder/super-pom.html"/>
     </menu>
 
     <menu inherit="bottom" name="Development">