Add call-out to Temporal Cloud on Quickstart pages

[webchick]

Temporal Affiliation

• I am a Temporal employee

Content Suggestion

We're currently discussing what links to send people at e.g. developer conferences, meetups, etc. to at the end of the event, and https://docs.temporal.io/quickstarts seems like a fantastic place, EXCEPT that there is no mention there that we have a Cloud product. :(

It would be good IMO to have one: at the top/bottom of the page, in a sidebar block, somewhere...

[tomwheeler]

Relatedly, the "next link" at the end just points to a long page of documentation about Workflows. IMHO, this would be the ideal time to push the learner towards the relevant Temporal 101 course (especially if the friction of the registration wall for that course is removed). That would keep them hands-on with the technology. And once the code for the exercises is updated to support environment- or profile-based configuration for Temporal Clients, the learner could effortlessly move between a local Temporal Service (started via the CLI) and Temporal Cloud (if they take advantage of the SSU link that Angie mentions).