Feature "Add to Calendar" button on detail/list view of a calendar item

[dgmouris]

Hey Folks,

I'd love a button for adding a single calendar event rather than subscribing to the entire calendar. I think this can be done quite quickly.

In the future, it would be cool to hook up something like a supabase db (or something else) and we can get the number of people for the events. I know meetup does this but it would be great to have a lot of this information not on meetup.

Refers to #394

Calendar View:

List View

Let me know what you folks think.

[jmietan]

I'm interested doing this.