Provide a migration page from the old single page to new split reference pages format #50
Description
Since Rust Reference underwent the split by chapters, all the links in the wild, like in answers on StackOverflow, are effectively dead, because they don't lead to the relevant parts of Reference anymore.
I realise the problems of handling url fragments, but couldn't a migration page be generated? Like http://doc.rust-lang.org/reference.html#tuple-types should go to a place in the page which says "This section has been moved to https://doc.rust-lang.org/reference/types.html#tuple-types", and so on for every anchor in the old reference page.
This would be much more helpful, as searching whatever chapters possibly contain the relevant data manually isn't quite easy.