We can link to chapter 1 using relative links, but links relative to the root won't work.
Linking to a sibling directory relative to the source root won't work either. We need to specify a link relative to here
This chapter is trying to detect a bug raised by @mark-i-m:
@Michael-F-Bryan I think it only shows up with nested, relative links. For example,
I just installed mdbook 0.2.1 and mdbook-linkcheck from the master branch of this repo (and verified that cargo used mdbook 0.2.1). No errors are reported, but the following link is broken:
https://github.com/rust-lang-nursery/rustc-guide/blob/master/src/traits/goals-and-clauses.md#L5