Move inventories into `local` directory
Move inventories into `local` directory

Change ansible/.gitignore to exclude a `local` directory, into which
can be put inventories that are not included in the `automation`
repository.

Upgrade note:
    Move any files named "staging", "production", "contentqa", or
    "central" to the new "local" directory.

dpla/automation,dpla/automation,dpla/automation