Add Positron to quarto get started page

[gshotwell]

It might be good to add Positron to this page, even though it's in beta. The quarto experience in Positron is already significantly better than most of the listed editors. https://quarto.org/docs/get-started/

[juliasilge]

We definitely will be wanting to do this, yes! From my perspective, I am a little hesitant to do it TODAY but I think this fall (before the end of the year) is probably a good time to get Positron on that page.

[icarusz]

Agreed! We will add it to the list and check in with the Positron team on timing!

[gshotwell]

As always I would just put it out there. There's plenty of warnings on the positron page, and Positron is head and shoulders above the other editors for working with Quarto.