Convert fluvio cli doc entries to cli-reference style

The `fluvio cli` sections need to be shifted to a detail reference style discussion

move existing cli doc content to tutorial, how-to or concept sections as it fits

Start by reviewing the existing `fluvio cli` documentation and the repository’s tutorial, how-to, and concept sections. Identify where each existing entry best fits, then reorganize the content into cli-reference style while moving material into those sections. Done means the CLI documentation follows the reference structure and the existing content has been appropriately relocated.

Written by the indexing model from the issue text.