Update Getting Started guide with better bot/worker instructions
Before raising this MR, consider whether the following are required, and complete if so:
- Documentation update(s)
If not required, please explain in brief why not.
Currently our Getting Started guide recommends using
bgd bot. That worker isn't very well supported, and definitely not the recommended worker for use in production. This MR updates those docs to recommend using
buildbox-casd instead, which is a much more sensible default setup to use and should help avoid giving the bad impression that
bgd bot is the canonical worker tool.
This MR also includes a few other improvements to the Getting Started docs, notably adding links to further more advanced usage documentation.