[Typo3-marketing] TYPO3.com refresh references

[Michelle Heizer]

> You have to take care of temporarely websites beeing away, but this can
> be coped with automatically I think.

Also, another concern -- intranet sites that are behind a firewall. Maybe an
option would be that people can only list their site in only one category.
That way we can use the wget method on all the references except sites in
the intranet category and prevent cross posting abuse.

Michelle