feat: add support for running via uvicorn; wutta webapp command

docs/narr/cli/builtin.rst

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+
+===================
+ Built-in Commands
+===================
+
+Below are the :term:`subcommands <subcommand>` which come with
+WuttaWeb.
+
+
+.. _wutta-webapp:
+
+``wutta webapp``
+----------------
+
+Run the web app, according to config file(s).
+
+This command is a convenience only; under the hood it can run `uvicorn
+<https://www.uvicorn.org/#uvicornrun>`_ but by default will run
+whatever :ref:`pserve <pyramid:pserve_script>` is setup to do (which
+usually is `waitress
+<https://docs.pylonsproject.org/projects/waitress/en/latest/index.html>`_).
+
+Ultimately it's all up to config, so run different web apps with
+different config files.
+
+Defined in: :mod:`wuttaweb.cli.webapp`
+
+.. program-output:: wutta webapp --help

docs/narr/cli/index.rst

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