feat: add basic "create order" feature, docs, tests

just the package API docs so far, narrative will come later

docs/narr/cli/builtin.rst

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+
+===================
+ Built-in Commands
+===================
+
+Sideshow comes with one top-level :term:`command`, and some
+:term:`subcommands<subcommand>`.
+
+It uses `Typer`_ for the underlying CLI framework.
+
+.. _Typer: https://typer.tiangolo.com/
+
+
+``sideshow``
+------------
+
+This is the top-level command.  Its purpose is to expose subcommands
+pertaining to Sideshow.
+
+It is installed to the virtual environment in the ``bin`` folder (or
+``Scripts`` on Windows):
+
+.. code-block:: sh
+
+   cd /path/to/venv
+   bin/sideshow --help
+
+Defined in: :mod:`sideshow.cli`
+
+.. program-output:: sideshow --help
+
+
+.. _sideshow-install:
+
+``sideshow install``
+--------------------
+
+Install the web app, generating config files based on interactive
+prompting.
+
+Defined in: :mod:`sideshow.cli.install`
+
+.. program-output:: sideshow install --help

docs/narr/cli/index.rst

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+
+==============
+ Command Line
+==============
+
+There isn't much to the command line for Sideshow, but here it is.
+
+For more general info about CLI see
+:doc:`wuttjamaican:narr/cli/index`.
+
+.. toctree::
+   :maxdepth: 2
+
+   builtin