feat(UI): Update formatting for Event Description
-Integrated TinyMCE text formatting in create_event.html -Added dependent files under static/tinymce_6.4.1 directory -Formatted the Event Description in event_details.html
-Integrated TinyMCE text formatting in create_event.html -Added dependent files under static/tinymce_6.4.1 directory -Formatted the Event Description in event_details.html