update centered_interval_tree

fix: properly handle adding new event

Calendar::default, render event descriptions in ui

Merge pull request #5 from Wooker/edit_event

make: add rule to clear today's events in db

make: add rule to clear today's events in db

feat(edit event): update event in db. Modify Input struct: store InputMode sequence in vec

feat(edit event): on 'e' in Select InputMode loads event info in popup and shows the popup

add Input struct to track input mode sequence

add comments to keypress/normal.rs

log app running result

save event description

db: get events ordered by start time

db: log the deleted event

remove redundant logs