Add "add to gmail|outlook.com|etc" ics/webcal links wherever we render an ics/webcal link

[idkidk000]

User story

I want to be able to add events directly from PlaceCal to my preferred big tech mail/cal provider so that I can get reminders and go to them.

Flamingos have a nice example of this: https://flamingoscoffeehouse.co.uk/events/ (bottom right)

Acceptance criteria

• criteria one
• criteria two

Implementation notes & questions

Implementation plan

To be written by the developer