docs: delete duplicate root CONTRIBUTING.md, add release-drafter ref to RELEASES.md

[Aaron ("AJ") Steers (aaronsteers)]

docs: delete duplicate root CONTRIBUTING.md, add release-drafter ref to RELEASES.md

Summary

Follow-up to #916, which added a root-level CONTRIBUTING.md with a Releasing section but missed the existing detailed contributing docs at docs/CONTRIBUTING.md and docs/RELEASES.md.

This PR:

• Deletes the duplicate root CONTRIBUTING.md (the canonical guide already lives at docs/CONTRIBUTING.md and is linked from README.md line 30)
• Adds a semantic-pr-release-drafter reference to the top of docs/RELEASES.md, which is the dedicated releases page for this repo

Updates since last revision

Per reviewer feedback:

• Root CONTRIBUTING.md is now deleted instead of kept as a redirect (it was a duplicate that shouldn't have been created)
• Reverted changes to docs/CONTRIBUTING.md — its Release Management section already just links to RELEASES.md, which is the right place for release content
• Moved the semantic-pr-release-drafter reference into docs/RELEASES.md instead

Review & Testing Checklist for Human

• Confirm README.md line 30 still links to docs/CONTRIBUTING.md correctly (no broken contributor onboarding path after root file deletion)
• Verify the new semantic-pr-release-drafter blurb at the top of docs/RELEASES.md reads well alongside the existing publishing instructions below it

Notes

Requested by: Aaron ("AJ") Steers (@aaronsteers)
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# Run the CLI from this branch:
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[Aaron ("AJ") Steers (aaronsteers)]

Ditto. Delete this dupe file.

[Aaron ("AJ") Steers (aaronsteers)]

Don't put this content here, since we have a dedicated page already for releases. Put the content into RELEASES.md - or if there's no need for that page anymore (because our new docs cover everything) delete it, in which case the content can live here.

[devin-ai-integration]

Done — reverted docs/CONTRIBUTING.md back to its original text (just links to RELEASES.md), deleted the duplicate root CONTRIBUTING.md, and moved the semantic-pr-release-drafter reference into docs/RELEASES.md at the top of the page. The existing repo-specific content in RELEASES.md is preserved.

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PyTest Results (Fast)

3 869 tests  ±0   3 857 ✅ ±0   6m 38s ⏱️ -13s
    1 suites ±0      12 💤 ±0 
    1 files   ±0       0 ❌ ±0 

Results for commit 2a1b63e. ± Comparison against base commit 7f41401.