mason.docs: make docs archive have relative paths.
mason.docs: make docs archive have relative paths.

dch/factor,factor/factor,factor/factor,nicolas-p/factor,factor/factor,nicolas-p/factor,AlexIljin/factor,mrjbq7/factor,sarvex/factor-lang,tgunr/factor,AlexIljin/factor,slavapestov/factor,dch/factor,AlexIljin/factor,nicolas-p/factor,bjourne/factor,bpollack/factor,sarvex/factor-lang,bpollack/factor,bjourne/factor,factor/factor,slavapestov/factor,dch/factor,bpollack/factor,nicolas-p/factor,tgunr/factor,mrjbq7/factor,factor/factor,nicolas-p/factor,slavapestov/factor,dch/factor,slavapestov/factor,sarvex/factor-lang,dch/factor,bpollack/factor,slavapestov/factor,AlexIljin/factor,mrjbq7/factor,tgunr/factor,mrjbq7/factor,mrjbq7/factor,dch/factor,nicolas-p/factor,bjourne/factor,mrjbq7/factor,sarvex/factor-lang,AlexIljin/factor,sarvex/factor-lang,bpollack/factor,bjourne/factor,tgunr/factor,slavapestov/factor,bjourne/factor,factor/factor,bpollack/factor,tgunr/factor,slavapestov/factor,sarvex/factor-lang,AlexIljin/factor,bpollack/factor,tgunr/factor,sarvex/factor-lang,nicolas-p/factor,bjourne/factor,AlexIljin/factor,bjourne/factor