fix: declare the dependencies the shipped Sphinx extension imports

[blaipr]

ascenderkit/cli/sphinx.py ships inside the package and imports docutils and sphinxcontrib.autoprogram, neither of which is a declared dependency or an extra. Installing the package and importing that module fails:

File ".../ascenderkit/cli/sphinx.py", line 3, in <module>
    from docutils.nodes import Text, paragraph
ModuleNotFoundError: No module named 'docutils'

The requirement was recorded in prose instead. ascenderkit/cli/docs/README.md told you to pip install sphinx sphinxcontrib-autoprogram by hand, which works until the list changes and the sentence does not.

Adds a docs extra with sphinx, sphinxcontrib-autoprogram and docutils, and points the README at pip install -e ".[docs]". docutils is listed explicitly even though sphinx pulls it in, for the same reason urllib3 is listed in install_requires: the code imports it by name, so it should not depend on arriving as somebody else's transitive.

Checked both directions: import ascenderkit.cli.sphinx raises ModuleNotFoundError from a clean install of the wheel, and after pip install ".[docs]" it gets past every import and reaches its own runtime requirement, "Please specify a valid CONTROLLER_HOST for a real (running) installation", which is the extension asking for a live server rather than a missing module.

Note for whoever merges: #37 moves extras_require into [project.optional- dependencies] in pyproject.toml, so whichever lands second needs this extra moved across with it.

[ciq-it-service-account]

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