Document bash files in system/

Signed-off-by: Severin Kaderli <severin.kaderli@gmail.com>

system/.xprofile

@@ -1,15 +1,17 @@
 #!/bin/bash
-# Disable screen saver
-xset s off
-xset -dpms
-xset s noblank
-
-# Set keyboard layout
-setxkbmap -model pc105 -layout ch
-
-# Start ibus
-ibus-daemon -drx
-
-if [[ -f "${HOME}/.bash_profile" ]]; then
-	. "${HOME}/.bash_profile"
-fi
+# 
+# SCRIPT NAME:
+# .xprofile
+#
+# AUTHOR:
+# Severin Kaderli <severin.kaderli@gmail.com>
+#
+# DESCRIPTION:
+# This is the startup script when LightDM starts. Currently it sources .xsetup
+# and .bash_profile so it's almost the same as if you start the x-server
+# manually.
+#
+# USAGE:
+# This script is executed when LightDM starts.
+. "${HOME}/.xsetup"
+. "${HOME}/.bash_profile"