fix(docs): MDX-safe TODO placeholders in journeydoc tutorials

[rubenvdlinde]

The journeydoc bootstrap left bare {{TODO: ...}} in docs/tutorials/**/*.md; Docusaurus 3 parses .md as MDX so {...} is read as JS and npm run build fails. Wrapped them in HTML comments. Docs build now passes.

[github-actions]

Quality Report — ConductionNL/openbuilt @ 38bebcf

Check	PHP	Vue	Security	License	Tests
lint	✅
phpcs	✅
phpmd	✅
psalm	✅
phpstan	✅
phpmetrics	✅
eslint		✅
stylelint		✅
composer			✅	✅ 100/100
npm			✅	✅ 432/432
PHPUnit					❌
Newman					❌
Playwright					⏭️

Coverage: 0% (0/19 statements)

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Quality workflow — 2026-05-12 22:12 UTC

Download the full PDF report from the workflow artifacts.