chore: remove decorative glyphs from docs output

[kioku]

Refs #174.

Summary:

• Replaced icon-based markers in CLI docs/help output with plain ASCII labels.
• Updated tests to assert against the new plain-text formatting.
• Removed decorative glyphs from active docs guidance and changelog grouping labels.

[kioku]

Summary

Remove decorative emoji/emoticon glyphs from Aperture's user-facing CLI documentation output and active repo docs, replacing them with plain ASCII labels while keeping the same information.

Branch

174/remove-repository-glyphs

Implementation Steps

1. Update src/docs.rs so command help, API overviews, and command lists use ASCII labels and plain method names instead of icon-based markers.
2. Adjust tests/docs_tests.rs to assert against the new plain-text output and preserve coverage of the same behavior.
3. Update active documentation examples and changelog grouping labels (docs/guide.md, cliff.toml) so repository-facing guidance no longer shows decorative glyphs.

Testing Approach

• Run the docs-focused test module first to validate the formatting changes quickly.
• Run cargo test after all edits to confirm the full suite still passes.
• If formatting or linting issues appear, run cargo fmt and re-run the affected tests.

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Codecov Report

✅ All modified and coverable lines are covered by tests.

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