Updated i3wm config
* removed unnecessary comments (the configuration is mostly self-explanatory)
* changed key combination for executing i3lock to control+alt+l instead of alt+l
** alt+l interferes with planned vim buffer navigation configuration changes
Moved buffer navigation remappings int gvim configuration
* they don't work in normal vim, so they should only be configured for gvim
** the problem is probably the terminal not forwardinf the keys as required by the remapping