Improve deployment and dev container documentation

[brooke-hamilton]

Benefit/Result/Outcome
Doc changes to be more explicit on .devcontainer usage for command-line deployments (vs local shell).

Description
The steps for cloning the project to a local machine apply to all usage paths (i.e. development container, command line, and UI deployments), but are only documented in this development container page. The "setup" steps in this page (e.g. the steps of getting the bits to the local machine and ready to run) should be moved to top-level "getting started" page. This aims to help simplify/clarify the "Command-Line Deployment" steps by avoiding some context switching across the different getting started pages. The command-line step-by-step page was then updated to be more explicit at the beginning around whether the command was run from the local BASH shell or from the BASH shell in the devcontainer.

Acceptance Criteria

• Simplified, more complete, and more organized documentation