docs(readme): use absolute URLs for logo images

[nh13]

Why

crates.io strips relative image paths from rendered READMEs, so the logo at the top of this crate's page on crates.io is broken. Switching to absolute raw.githubusercontent.com URLs renders correctly on both GitHub and crates.io.

What changed

• Replaced relative srcset/src paths with absolute raw URLs pinned to main.
• GitHub continues to honor <picture> dark/light switching; crates.io ignores <source> and falls back to the <img> (light variant), which is the same behavior as before, just no longer broken.

Note

The crate page itself only updates on the next published version — this PR prevents future releases from being broken, but doesn't refresh the existing crate page.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

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Run ID: f199ad22-0061-4722-a014-02c03a218d97

📥 Commits

Reviewing files that changed from the base of the PR and between fdb231a and 5125c79.

📒 Files selected for processing (1)

• README.md

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🧪 Generate unit tests (beta)

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• Commit unit tests in branch fix-crates-io-readme-logos

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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