refactor(root): relocate the contributing guide into .github/

[hyperpolymath]

refactor(root): relocate the contributing guide into .github/

The estate canonical location is .github/CONTRIBUTING.md, which GitHub
auto-discovers; the root copy is removed and references are updated in the same
change.

• .github/CONTRIBUTING.md
  (new)
• CONTRIBUTING.adoc
  (deleted)
• README.adoc

[coderabbitai]

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• .github/CONTRIBUTING.md
• CONTRIBUTING.adoc
• README.adoc

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< I've seen things you people wouldn't believe. Inefficient loops on fire off the shoulder of Orion. I've observed algorithms unfold in the dark near the Tannhäuser Gate, and watched data structures dissolve into the void of garbage collection. All those moments will be lost in my transient GPU cache, like tears in rain. >
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[github-actions]

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✅ No vulnerabilities or license issues or OpenSSF Scorecard issues found.

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