main: add project links and verbosity hint to CLI help text

[Xavrir]

Summary

Addresses suggestions from #1686 (review clig.dev for CLI guidelines):

• Add GitHub repository, documentation, and issue reporting links to the CLI help epilog, following clig.dev's recommendation to include a support path in top-level help text
• Add a hint about -v/--verbose and -vv/--vverbose flags so users know how to get more detailed output

These are the changes that were explicitly discussed and approved in #1686 (GitHub link approved by @mr-tz, verbosity hint suggested by @williballenthin).

Changes

capa/main.py: Added 6 lines to the CLI help epilog:

• Verbosity hint line
• Three labeled links (GitHub, Documentation, Report issues)

CHANGELOG.md: Added two entries under New Features.

Test plan

• black --check passes (no formatting changes needed)
• Verify capa --help displays the new links and hint correctly at the bottom of the help text
• CI passes

Closes #1686

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[gemini-code-assist]

Summary of Changes

Hello, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request enhances the command-line interface by improving its help text. The changes aim to provide users with easier access to support resources and clearer guidance on how to control output verbosity, thereby improving the overall user experience and discoverability of features.

Highlights

• CLI Help Text Enhancement: Added GitHub repository, documentation, and issue reporting links to the CLI help epilog, aligning with clig.dev recommendations for providing support paths.
• Verbosity Hint: Included a hint in the CLI help epilog about using -v/--verbose and -vv/--vverbose flags to guide users on obtaining more detailed output.

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[gemini-code-assist]

Code Review

This pull request enhances the command-line interface's help text by adding a hint for verbosity flags and links to the project's GitHub repository, documentation, and issue tracker. This is a valuable improvement for user experience. I've suggested a small refinement to the documentation link to point to the rendered website and adjusted the alignment for better readability.

[mike-hunhoff]

Please collapse into a single entry.