Adjust i3 colors, update KBDs, remove icons from i3statusbar

May need to find a better KBD for `snip_it`, since I really enjoy Tmux's M-s to
switch sessions.

Learned about i3's "edge" concept. Re-supported KBDs for settings split
directions. Also adjusted theme colors.

Also adjusts the formatting of the timezone information to show GMT as LON, EST
as NYC, and Pacific as MTV.

configs/shared/misc/.config/i3status/config

@@ -4,26 +4,31 @@ general {
         colors = true
 }
 
-order += "time"
+order += "tztime lon"
 order += "tztime est"
 order += "tztime pst"
 order += "disk /"
 
 disk "/" {
      prefix_type = "decimal"
-     format = "%avail / %total"
+     format = "%used/%total"
 }
 
-time {
-     format = "%H:%M - %D"
+# Useful commands for dealing with timezones:
+# - cat /etc/timezone
+# - man date
+# - timedatectl
+tztime lon {
+     format = "LON %H:%M"
+     timezone = "Europe/London"
 }
 
 tztime est {
-     format = "%H:%M EST"
+     format = "NYC %H:%M"
      timezone = "US/Eastern"
 }
 
 tztime pst {
-     format = "%H:%M PST"
+     format = "MTV %H:%M"
      timezone = "US/Pacific"
 }