link edit event page to backend

[ryanhu021]

Link the edit event page to the PATCH /events route. You will need to do a few things for everything to work together correctly:

• The edit event component should take an event prop that represents the event being edited.
• Modify the route in App.tsx to have an :eventId URL parameter. This should be similar to the log hours route.
• In events.tsx, make an edit button (pencil icon next to the trash icon) on each event that links to the edit page.
• Use the validation and functions from createEvent.tsx as a reference to connect it to the backend.