docs: update documentation with consistent paths, versions and formating

[fentas]

This pull request updates the documentation for all b CLI subcommands to provide clearer, more concise, and consistent usage instructions. The changes improve discoverability, clarify flag usage, and streamline examples across all command docs. The most important changes are grouped below by theme:

General Documentation Improvements:

• Updated command descriptions and usage sections for all subcommands (completion, init, install, list, request, search, update) to be more concise and user-focused. [1] [2] [3] [4] [5] [6] [7]

Command-Specific Enhancements:

• Added or improved examples for each command, showing typical usage scenarios and flag combinations, including output formatting and configuration options. [1] [2] [3] [4] [5] [6] [7]
• Updated installation and configuration instructions for shell completions, including recommendations for bash-completion and Oh My Zsh. [1] [2]

Flags and Options Standardization:

• Standardized flag tables and descriptions for each command, clearly separating command-specific flags from global flags. [1] [2] [3] [4] [5] [6]
• Added details on output formatting flags (e.g., --output json|yaml) for list and search commands. [1] [2]

Aliases and Command Discovery:

• Documented command aliases (e.g., ls, l for list; s for search; u for update) to improve discoverability and usability. [1] [2] [3]

Removal of Redundant and Outdated Content:

• Removed repetitive, outdated, or overly verbose sections, such as detailed error handling, best practices, and project structure explanations, to keep docs focused and actionable. [1] [2] [3] [4] [5] [6] [7]