CHANGE: Minor improvements + updated api docs

Backend/models/workDay.go

@@ -7,8 +7,8 @@ import (
 )
 
 type WorkDay struct {
-	Day       time.Time
-	Bookings  []Booking
+	Day       time.Time `json:"day"`
+	Bookings  []Booking `json:"bookings"`
 	workTime  time.Duration
 	pauseTime time.Duration
 }