Fix doc failure on compatibility matrix

[gansheer]

What happened?

The compatibility matrix has been removed from the main documentation.
It was failing the camel-website build because some magic javascript that requires 8 columns.

We need to add it back and make sure it does not fails upstream.

Note: after it would be good to add it back in blog posts.

Steps to reproduce

No response

Relevant log output

No response

Camel K version

main