Create man page for blk-archive

Create man page for blk-archive

There is currently no man page available for blk-archive, which makes it harder for users to discover and understand its functionality and usage conventions through standard Unix documentation practices.

This issue is to track the creation of a proper man page (blk-archive.1) that can be installed alongside the binary and accessed via man blk-archive.

Expected contents of the man page

• NAME – short description of what blk-archive does
• SYNOPSIS – CLI usage and flags
• DESCRIPTION – high-level overview of what the tool is for, key features
• OPTIONS – detailed list of all CLI flags and subcommands
• EXAMPLES – sample commands with common usage patterns
• EXIT STATUS – description of exit codes
• FILES – any configuration or output file formats, if applicable
• AUTHOR – credit and maintainer info
• SEE ALSO – references to related tools, e.g., tar(1), rsync(1), etc.