Make betterlockscreen compatible with wip rewrite of i3lock-color (be…

…tterlockscreen#37)

* Changed time position property to be compatible with i3lock update

* Also changed date position variable

* Use latest text color properties

* Remove no input text

shortened and imo improved Readme (betterlockscreen#26)

related to betterlockscreen#25 and adds documentation for betterlockscreen#21

shortened and imo improved Readme (betterlockscreen#26)

related to betterlockscreen#25 and adds documentation for betterlockscreen#21