Remove -v option alias from CLI

The `-v` alias for the `--version` flag in the CLI was an accident. While it's fine in this application, I tend to use it as an alias for `--var` in other CLIs, so in order to avoid confusion, it should come out of this app.

Start by locating the CLI option definition for --version and inspect the generated help or option parsing behavior. Remove only the -v alias, then verify that --version still works and -v is no longer accepted.

Written by the indexing model from the issue text.