feat: generate GitHub Pages nav from the docs filesystem

[TMHSDigital]

Summary

• Scan docs/ folders at build time so new guides show up in the sidebar, home page, section indexes, and search without editing mkdocs.yml.
• Pin MkDocs Material, add git revision dates, and drop the four template stub pages.
• Add Amazon Ads and rewrite EMAIL, PRINT, NATIVE, FAQ, and EXAMPLES. Every channel now links to LEGAL, BUDGETING, and ANALYTICS.
• Lychee runs prepare-mkdocs.py first and skips bot-walled hosts. Dependabot build(deps): Bump DavidAnson/markdownlint-cli2-action from 23 to 24 #8 and build(deps): Bump actions/setup-python from 6 to 7 #9 are already merged.

Test plan

• python -m unittest scripts.test_catalog -v
• python scripts/check-public-repo-hygiene.py
• python scripts/check-internal-links.py
• python scripts/prepare-mkdocs.py && mkdocs build --strict
• npx markdownlint-cli2 ""**/*.md""
• CI on this PR is green
• After merge, GitHub Pages rebuilds and Amazon Ads appears in nav

Made with Cursor

[socket-security]

Review the following changes in direct dependencies. Learn more about Socket for GitHub.

Diff	Package	Supply Chain Security	Vulnerability	Quality	Maintenance	License
	mkdocs-material@​9.7.7 ⏵ 9.7.6
	mkdocs-git-revision-date-localized-plugin@​1.5.4

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