Fix link to relocated contribution/authoring guide (DOC-2303)

[JakeSCahill]

Description

Related to https://redpandadata.atlassian.net/browse/DOC-2303.

docs-site/meta-docs/CONTRIBUTING.adoc was split and renamed to AUTHORING.adoc (redpanda-data/docs-site#201), then that file was deleted entirely and ported to internal-only redpanda-data/cupboard (redpanda-data/cupboard#677) — every one of these repos' local-antora-playbook.yml cross-fetches the private docs/cloud-docs/rp-connect-docs/adp-docs repos to build locally at all, so the audience for that guide was already internal in practice.

This repoints both the "clone locally" contribution link and the "Set up GitHub authentication" pointer at the ported cupboard guide.

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📝 Walkthrough

Walkthrough

README.adoc now directs contributors to AUTHORING.adoc and uses the description “Build and test your changes locally” instead of linking to CONTRIBUTING.adoc with “Submit your first contribution.”

Estimated code review effort: 1 (Trivial) | ~2 minutes

Suggested reviewers: feediver1

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Title check	✅ Passed	The title clearly and concisely describes the link fix and identifies the related ticket.
Description check	✅ Passed	The description identifies DOC-2303 and clearly explains the documentation link updates and their rationale.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch doc-2303-fix-contributing-link

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