MTA 5.2.1.Final - Update developers website

Make sure all of the links for the docs are pointing to the 5.2 versions.

We definitely need to add a link to the VSCode Extension Guide  https://access.redhat.com/documentation/en-us/migration_toolkit_for_applications/5.2/html/visual_studio_code_extension_guide 

We might want to consider adding some additional content on the Use Cases page to show that we cater for Jakarta EE 9 - link

I think a Jakarta EE 9 column to the left of Camel 3 with a tick for the Any Java application row.

We should add some text in bold on both the Overview and Downloads page immediately below the tabs

MTA does not depend on Log4j 2 so we are not affected by CVE-2021-44228.

Is the caveat about EAP XP2 still appropriate?