feat(a11y): improve voiceover a11y for datetime component

Remove formatDatetime function. Created a JSX function component (FormattedDatetime) inside Datetime
component. This component returns formatted date and time with better voiceover enhancements.

src/utils/formatDatetime.ts

@@ -1,14 +0,0 @@
-const formatDatetime = (datetime: string) => {
-  const myDatetime = new Date(datetime);
-  return (
-    myDatetime.toLocaleDateString([], {
-      year: "numeric",
-      month: "long",
-      day: "numeric",
-    }) +
-    " | " +
-    myDatetime.toLocaleTimeString([], { hour: "2-digit", minute: "2-digit" })
-  );
-};
-
-export default formatDatetime;