README/Documentation Updates

[cartermak]

• Remove any examples that are just copies of help text from the CLI
• Reconsider how we document specific commands (consider removing the full documentation of the plans/models commands)
• Consider restructuring some examples into a "Cookbook"
• Document CLI completion (need compinit in .zshrc)

[cartermak]

Updated thoughts:

• We should auto-generate CLI documentation. To start, we can do this with typer-cli.
• We should consider auto-generating full documentation of the API using something like Sphinx. Libraries that seem to have been added to aerie-cli a long time ago but not fully integrated include the furo theme and sphinx-click.
• Coverage reports can be re-added (with automation, assuming we want them to be used) by importing coverage as a dev dependency and configuring in pyproject.toml:

[tool.coverage.paths]
source = ["src", "*/site-packages"]
tests = ["tests", "*/tests"]

[tool.coverage.run]
branch = true
source = ["aerie_cli", "tests"]

[tool.coverage.report]
show_missing = true
fail_under = 100

[cartermak]

Partially migrated to #76 and will otherwise be closed by #77.