Old MonadCatchIO-mtl does not build

Signed-off-by: Ricky Elrod <ricky@elrod.me>
Use a fork of "cgi" until upstream builds on 7.8

Signed-off-by: Ricky Elrod <ricky@elrod.me>
Link each source when rendering its name

Signed-off-by: Ricky Elrod <ricky@elrod.me>