Update quickstart

[cdrage]

Remove ▶ from CLI commands as well as remove .dab reference.

[cdrage]

Doing a lazy merge (no reviews) in order to incorporate site changes.

[surajssd]

Why remove the ▶ or $ this helps distinguish between the command and it's output?

If you have multiple commands which are shown without any output, there it makes sense to not have $ because the user can copy the block and paste it in terminal.

But when we are showing output i think we should have command starting with $ .

[cdrage]

@surajssd After discussion, I'm going to re-add the $. You're right. It's confusing and I don't like it either 👎 after viewing it almost-daily when modifying the docs and all.