Prefer Emacs client-server setup

This change affects:
  - alias e
  - i3 KBDs
  - .xsessionrc

It will be interesting to see how this works over SSH. In theory, the
ALTERNATE_EDITOR variable should kick in and `vim` should be used. Time will
tell if this is the preferred setup. Until then...

configs/shared/x_server/.xsessionrc.shared

@@ -16,6 +16,9 @@ xsetroot -solid "#333333"
 # This might be better for SSH.
 tmux new -d -s main
 
+# Start the Emacs server
+emacs --daemon
+
 # set kbds
 xmodmap -e 'remove Lock = Caps_Lock'
 xmodmap -e 'keysym Caps_Lock = Escape'