UI: Add "Add to your calendar" to event card and show page

[jmilljr24]

Update the cards on the index page and the show page to include the text "Add to your calendar" need the buttons we have to add the event to different services (google, apple....). Maybe below the links but try things out and see what looks best.

[Abhiishekk31]

Can I work on this?
I will make sure to make a seperate branch this time and keep all the necessary files intact and no trouble this time.
@jmilljr24

[jmilljr24]

@Abhiishekk31 you're not trouble, just learning! All good.

Please include screenshots of both pages with your PR.

[Abhiishekk31]

#802

Only added the text add to calendar, wanted to add a few icons of brand calendars instead of link names, but idk if it will actually look good ?