Following Luma-based calendars

[szabgab]

I am switching from Meetup to Luma to handle the registration of my events.
It would be nice if the events would be included in the issues the same way events using Meetup are.

Luma provides the list of events in ics format:

My channel is https://luma.com/rust-maven and the ics is https://api.luma.com/ics/get?entity=calendar&id=cal-ThoZUSuwBbWLTKb

There are a few other Rust-related channels I found:

• Mexico https://luma.com/rustmx ics: https://api.luma.com/ics/get?entity=calendar&id=cal-SJK7sG9PNjKOLjh
• Melbourne https://luma.com/rustmelbourne ics: https://api.luma.com/ics/get?entity=calendar&id=cal-5ZOKiIsPy6ABGYU
• São Paulo https://luma.com/rustsp ics: https://api.luma.com/ics/get?entity=calendar&id=cal-bif2oHITU1aVvsr
• Rust SC (Santa Catarina, Brazil) https://luma.com/rust-sc ics: https://api.luma.com/ics/get?entity=calendar&id=cal-iOloL5ZqswCO5Mm
• Rust Girona https://luma.com/rust-girona ics: https://api.luma.com/ics/get?entity=calendar&id=cal-YjQVtnwkdU40fBI

[szabgab]

I've opened a PR to manually add the first event: #8465