PF MCP - add overview documentation to the website

[evwilkin]

This issue tracks the addition of MCP overview & documentation to the PF website. The creation of that material is tracked in https://issues.redhat.com/browse/UXDENG-368.

Work in progress doc: https://docs.google.com/document/d/1dhSPyJrokYDfLjAZKWXj-qv8xNn34f4mPk_5xzlRZkU/edit?tab=t.uy11iy7suaz7