kiosk/website: Added link to page explaining Chrome shortcuts

roles/kiosk/website/templates/i3.cfg

@@ -79,8 +79,8 @@ bindsym $mod+Control+s exec "systemctl poweroff"
 # reboot computer
 bindsym $mod+Control+r exec "systemctl reboot"
 
-# open homepage on windows button
-bindsym --release Super_L exec "xdotool key Alt_L+Home"
+# Chromium Key Bindings, see https://support.google.com/chrome/answer/157179?co=GENIE.Platform%3DDesktop&hl=en
+bindsym --release Super_L exec "xdotool key Alt_L+Home" # open homepage on windows button
 
 exec --no-startup-id xsetroot -solid {{ i3_background | quote }}