Move commands from 'GuestInfoFrontend/commands' to 'GuestInfoFrontend/bin'

We are moving all developer commands from commands to bin. This is because bin is the standard directory name on Linux systems, and because command is an actual Linux command and so bash-completion has problems with it when using tab expansion.

1. Rename commands to bin
2. Some scripts refer to other scripts. Update all scripts paths to use bin.
3. Make sure that .gitlab-ci.yaml environment variables for pipeline stages like build, test, and release are using the correct path to those scripts. See https://gitlab.com/LibreFoodPantry/client-solutions/theas-pantry/documentation/-/blob/main/.gitlab-ci.yml?ref_type=heads as an example.