AutoOps for serverless: Intro page

[consulthys]

PoC: Valentin Crettaz

We need to create an introduction page for AutoOps for Serverless that shows up in the main page content when selecting "For Elastic Cloud Serverless" in the main menu.

The content is here: https://docs.google.com/document/d/1ejpctG2YHfnhuVSwu8W9m5-lty_sMUt11DdFFvWhyOg/edit?tab=t.tpr2zx9k0w3u#heading=h.82oe1qmb5g9x