docs: fixing docs contributor guide

[psschwei]

Pull Request

Issue

Fixes #965

Description

Moves docs/docs/guide/CONTRIBUTING.md to docs/CONTRIBUTING_DOCS.md (alongside docs/AGENTS_TEMPLATE.md and docs/PUBLISHING.md), strips the Mintlify frontmatter, and removes the now-empty docs/docs/guide/ directory — clarifying that this is a repo-level docs-writing guide, not a published site page. Updates the 8 references across CONTRIBUTING.md, AGENTS.md, the docs-autogen tooling, the docs-publish workflow, and three doc pages to point at the new path. Fixes a broken redirect in docs.json (/core-concept/contribution-guide → /community/contributing-guide, which is the actual user-facing contributing page in nav).

Testing

• Tests added to the respective file if code was changed
• New code has 100% coverage if code was added
• Ensure existing tests and github automation passes (a maintainer will kick off the github automation when the rest of the PR is populated)

Attribution

• AI coding assistants used

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[ajbozarth]

LGTM, the CI is hitting a linting failure you need to fix though