[DX-3059] Prepare local CRE docs for central docs

docs/index.md

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+---
+title: CRE Docs
+sidebar_position: 0
+---
+
+# CRE Docs
+
+This local docs bundle exposes documentation from the `chainlink` repository through the CRE Docusaurus site.
+
+## Main Sections
+
+- [Local CRE](local-cre/index.md)
+- [Configuration Reference](CONFIG.md)
+- [Secrets Reference](SECRETS.md)
+- [Contributing](CONTRIBUTING.md)
+- [Community](COMMUNITY.md)
+
+## Local CRE
+
+For Local CRE environment setup, workflow operations, topologies, and CRE smoke tests, start here:
+
+- [Overview](local-cre/index.md)
+- [Getting Started](local-cre/getting-started/index.md)
+- [Environment](local-cre/environment/index.md)
+- [System Tests](local-cre/system-tests/index.md)

docs/local-cre/_category_.yaml

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+position: 50
+label: "Local CRE"
+collapsible: false
+collapsed: false
+link:
+  type: doc
+  id: local-cre-index

docs/local-cre/environment/_category_.yaml

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+position: 2
+label: "Environment"
+collapsible: false
+collapsed: false
+link:
+  type: doc
+  id: local-cre-environment-index