Feature: Added Happy Hour Discount in the bill display and changed Net amount to Gross Amount.

Changed the color of running / printed tables to a brighter colors.

bookie/src/app/guest-book/guest-book-list/guest-book-list.component.css

@@ -3,11 +3,11 @@
 }
 
 .running {
-  background-color: #f8cbad;
+  background-color: #f53d24;
   color: #000000;
 }
 
 .printed {
-  background-color: #c6e0b4;
+  background-color: #00f518;
   color: #000000;
 }