Release notes pages don't show release date

Release note files include release date:

https://github.com/freeipa/freeipa.github.io/blob/e55b7381c882b15890fbb64db641db28197c19f0/src/release-notes/4-12-4.rst?plain=1#L6

But it's not shown once the page is rendered:

<img width="803" height="350" alt="Image" src="https://github.com/user-attachments/assets/45854115-a8c0-4765-9358-c3e80164b92c" />