docs: rename docs to old_docs and promote new docs set

[mutl3y]

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[Copilot]

Pull request overview

This PR updates the GitHub Pages/Jekyll documentation set by ensuring the dev docs pages are processed and rendered correctly, and by aligning the site configuration with the project-site URL structure.

Changes:

• Add Jekyll front matter (layout, title) to multiple docs/dev_docs/*.md pages so they render as site pages.
• Update docs/_config.yml to set baseurl: "/prism" for the project site.

Reviewed changes

Copilot reviewed 14 out of 14 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
docs/dev_docs/style-guide-sources.md	Adds Jekyll front matter and title metadata.
docs/dev_docs/static-analysis-scope.md	Adds Jekyll front matter and title metadata.
docs/dev_docs/source-evaluation-matrix.md	Adds Jekyll front matter and title metadata.
docs/dev_docs/roadmap.md	Adds Jekyll front matter and title metadata.
docs/dev_docs/provenance-tracking.md	Adds Jekyll front matter and title metadata.
docs/dev_docs/contributing.md	Adds Jekyll front matter and title metadata.
docs/dev_docs/completed-plans.md	Adds Jekyll front matter and title metadata.
docs/dev_docs/cli-targets.md	Adds Jekyll front matter and title metadata.
docs/dev_docs/ci-starter-workflows.md	Adds Jekyll front matter and title metadata.
docs/dev_docs/changelog.md	Adds Jekyll front matter and title metadata.
docs/dev_docs/architecture.md	Adds Jekyll front matter and title metadata.
docs/dev_docs/annotation-quality-workoff.md	Adds Jekyll front matter and title metadata.
docs/dev_docs/README.md	Adds Jekyll front matter and title metadata.
docs/_config.yml	Adjusts GitHub Pages baseurl to /prism.