feat: updated docs and added description to files

Backend/helper/time.go

@@ -1,5 +1,7 @@
 package helper
 
+// time helpers
+
 import (
 	"fmt"
 	"time"
@@ -27,11 +29,6 @@ func IsWeekend(ts time.Time) bool {
 	return ts.Weekday() == time.Saturday || ts.Weekday() == time.Sunday
 }
 
-func GetKW(t time.Time) int {
-	_, kw := t.ISOWeek()
-	return kw
-}
-
 func FormatDuration(d time.Duration) string {
 	return FormatDurationFill(d, false)
 }