Modernize setup and dependencies

[dspruell-i01]

The current installation/setup should be modernized to streamline it for new users with a typical use case for CLI interaction.

Current UX:

1. Installation using pip or pipx results in a non-operational client (missing dependencies).
2. Installation for CLI usage requires use of pipenv, which is unorthodox (it's really used for replicating consistent development environments).
3. Installation requires access to the Git repo to access a template configuration file to be edited by the user to complete setup.
4. Configuration file uses a generic name (config.yml) and setup instructions seem to assume that the CLI tool will be run from the Git checkout with the config file local to the checkout.

Recommended/improved UX:

1. Installation with pip or pipx should be one-shot, with dependencies specified in the pyproject.toml (modern) or setup.py (dated but supported). pipx is used when only the CLI will be used and no library usage is expected; pip is used when a user is expected to use the module as a library. Both should result in the installation of all dependencies.
2. Eliminate pipenv from the UX.
3. Add a supported CLI command to prompt the user for host and API key and output a functional configuration file. Common commands include init, setup, or config, etc.
4. The output config file should be stored as a dotfile in $HOME (old) or in ~/.config (new).
   • The old dotfile method would be a named file such as $HOME/.iq-cli.yml; this is considered legacy and has been replaced by a new config file spec in Freedesktop standards.
   • The modern Freedesktop spec would use a file at $XDG_CONFIG_HOME (https://specifications.freedesktop.org/basedir-spec/latest/ar01s03.html) using a path such as $HOME/.config/iq-cli/config.yml.