mr: Delete ~/.config/mr

This tool was not for me.
redshift: Add montreal.conf
redshift: Place default config in correct location

redshift reads ~/.config/redshift.conf, not
~/.config/redshift/default.conf.
notmuch: Fix undefined variable in notmuch-rm-duplicates

It took so long to find because the the undefined variable got
dereferenced only in an error path.
ogit: Add script
ogit: Add config for public profile