For a while now, the "contact us" link in the footer or every Stack Exchange site points to
http://[site]/help (e.g. https://meta.stackoverflow.com/help) which is all good.
However in the Data Explorer site it's still the good old
There are other links missing in the footer, but that's a different issue and not a big deal.
(Marking this feature-request as it's not really a bug but require manual changing of code)