start moving from prezto to antigen-hs

Signed-off-by: Joshua Rubin <jrubin@zvelo.com>
remove zprezto

Signed-off-by: Joshua Rubin <jrubin@zvelo.com>
continue speeding up zsh

Signed-off-by: Joshua Rubin <jrubin@zvelo.com>
complete transition to antigen

Signed-off-by: Joshua Rubin <jrubin@zvelo.com>
add mcd

Signed-off-by: Joshua Rubin <jrubin@zvelo.com>