some refactoring, fixed addEmployeeModal, played with scss

src/types/schedule-data.d.ts

@@ -4,9 +4,15 @@ type ScheduleData = [
 
 type Employee = {
     id: number,
-    name: string,
-    handle: string
+    first_name: string,
+    last_name: string,
+    email: string,
+    phone: string,
+    mobile: string,
+    role: string,
+    shorthand: string,
     contractHours?: number
+    username?: string
 }
 
 type ScheduleRow = {