[scripts] add a script for searching manpages with fzf

scripts/visman

@@ -0,0 +1,3 @@
+#!/bin/sh
+
+man $(apropos '' | fzf --no-multi --tiebreak=begin | sed -n 's/^\([^ ]\+\) (\([^)]\+\)).*$/\2 \1/p')

zsh/path.zsh

@@ -2,7 +2,8 @@
 
 # tie these env variables to zsh arrays
 typeset -T PKG_CONFIG_PATH pkg_config_path ':'
-export PKG_CONFIG_PATH
+
+export PKG_CONFIG_PATH PATH MANPATH
 
 path_prepend() {
   if (( $# < 2 )); then