Site: Maven components left nav missing label

After [this change](https://github.com/apache/maven-parent/commit/07ca249039e32b22fa2d9d78da8a643cb0950468)

The new sub section for the left nav appears to be listed under the "site" section:
image-2024-06-18-14-39-05-927.png

This section should be labeled, to be something like:
image-2024-06-18-14-39-23-934.png