Android has a reader app for common unix/linux manpages:
https://play.google.com/store/apps/details?id=com.oscd.manpages&hl=en
It doesn't include everything though. I wrote this script to add pages for git (so meta...) and I had been meaning to pick up some python.
sync-oscd-manpages.py -f <file> -m <man-pages> -u
-
-f|--file
path to manpages sqlite file on the device SD card -
-m|--man comma separated list of man pages to add
-
-u|--update allow existing pages to be updated.
This software has not been tested in a very long time. USE AT YOUR OWN RISK.