Explain why is a bad idea to use an old version of Tails in the FAQ

Many times, specially when facing a hardware support regression, users ask frontdesk for the previous version of Tails that is not found on the website anymore.

Maybe we could add a FAQ explaining why this is a bad idea? And title it: "Where can I get older version of Tails" so users looking for old versions see it.

In frontdesk we tell them:

It is not advisable to use older versions of Tails
because they contain publicly available vulnerabilities.

On each of our release notes there is also the message:

This release fixes many security vulnerabilities.
You should upgrade as soon as possible.

So maybe the FAQ could elaborate a bit more onto that.