Rename type definition files. Update documentation. Update date-fn functions being used.

types/Calender.d.ts

@@ -0,0 +1,52 @@
+type Days =
+  | "Sunday"
+  | "Monday"
+  | "Tuesday"
+  | "Wednesday"
+  | "Thursday"
+  | "Friday"
+  | "Saturday";
+
+type DaysOfWeek = Days[];
+
+interface WeekDays {
+  sunday: DaysOfWeek;
+  monday: DaysOfWeek;
+}
+
+interface MonthDay {
+  date: string;
+  isOverflow: boolean;
+  overflowDirection: "prev" | "next" | null;
+}
+
+interface Month {
+  week1: MonthDay[];
+  week2: MonthDay[];
+  week3: MonthDay[];
+  week4: MonthDay[];
+  week5: MonthDay[];
+  week6: MonthDay[];
+}
+
+interface WeekLayout {
+  weekdays: DaysOfWeek;
+  month: Month;
+}
+
+interface MonthLayout {
+  sunday: WeekLayout;
+  monday: WeekLayout;
+}
+
+interface UpdateCalendarProps {
+  year: number;
+  month: number;
+  day: number;
+}
+
+interface SelectedDateInfo {
+  date: string;
+  title: string;
+  layout: MonthLayout;
+}