resurrect research paper list

[vks]

With removing the wiki, the list of research papers was removed as well. They still can be found here. However, this location is really hard to find, and I think it is a quite interesting resource.

Would it make sense to add it to the documentation in the main rust repo?

[steveklabnik]

Yes, that'd be great.

[nikomatsakis]

This does feel like the kind of thing for which wikis are a very good fit.

[vks]

Well, we killed the wiki, didn't we?