Replace update-docs-help.py script with cog

[simonw]

I introduced cog in #1594 - I can use this to replace the older update-docs-help.py mechanism:

datasette/tests/test_docs.py

Lines 36 to 53 in 76d66d5

	@pytest.mark.parametrize(
	"name,filename",
	(
	("serve", "datasette-serve-help.txt"),
	("package", "datasette-package-help.txt"),
	("publish heroku", "datasette-publish-heroku-help.txt"),
	("publish cloudrun", "datasette-publish-cloudrun-help.txt"),
	),
	)
	def test_help_includes(name, filename):
	expected = (docs_path / filename).read_text()
	runner = CliRunner()
	result = runner.invoke(cli, name.split() + ["--help"], terminal_width=88)
	actual = f"$ datasette {name} --help\n\n{result.output}"
	# actual has "Usage: cli package [OPTIONS] FILES"
	# because it doesn't know that cli will be aliased to datasette
	expected = expected.replace("Usage: datasette", "Usage: cli")
	assert expected == actual, "Run python update-docs-help.py to fix this"

[simonw]

There are four places in the documentation that use .. literalinclude:: at the moment which I can replace - I can actually just link directly to the new https://docs.datasette.io/en/latest/cli-reference.html page instead of embedding the help directly.