Docs(Quickstart): Make 'steps need to be run from same working directory' requirement more explicit.

[mlwelles]

Modified the quick start guide to make more explicit the requirement that the steps need to be run from the same working directory.

Additionally:

• I changed the wget invocations to their curl equivalents, since curl is already required for the verify step, and wget isn't installed by default on macos.
• Modifed the curl / jq invocation in the verify step to print the value of the "status" field
• For folks who don't have jq installed, added a grep command variant that prints either "healthy" or "NOT healthy" to (almost) match jq output.