Standardize help commands and terminology for improved usability

[crashingstatic]

PR: Standardize help commands and terminology for improved usability

Description

This PR implements the changes proposed in Issue #13 to improve command-line interface consistency. All instances of "manpage" have been replaced with "help page" throughout the codebase, and the non-standard --manpage flag has been updated to use the UNIX standard -h/--help flags.

This change improves usability by adhering to well-established CLI conventions that users expect. As an additional benefit, it also aligns with inclusive language recommendations in GitHub's [Community Guidelines](https://docs.github.com/en/site-policy/github-terms/github-community-guidelines#maintaining-a-strong-community) and the OpenSource Community's [Code of Conduct](https://www.contributor-covenant.org/version/2/1/code_of_conduct/code_of_conduct.md).

Changes

• Replaced 36 instances of "manpage", "print_man", and "man page" in source files
• Changed command-line flag from --manpage to standard -h/--help options
• Updated function and variable names for consistency (e.g., print_man() → print_help())
• Updated documentation to reflect new command-line interface

Testing

• Linux binaries build correctly
• Verified that new -h/--help flags display help correctly
• Confirmed help output refers consistently to "help page" terminology

Notes for Reviewers

• Please check for any instances I may have missed
• The command-line interface change should be included in the changelog as it affects user interaction
• Please rebuild the binaries necessary to reflect these changes

Related Issues

Resolves: #13 (Standardize help commands and terminology)