Implement pretty URLs by removing .html extension and adding redirectentries for existing posts

[szolkowski]

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[github-actions]

🎭 UI Regression Tests

✅ All 24 tests passed (20.9s)

Status	Count
✅ Passed	24
❌ Failed	0

All tests (24)

	Test	Time
	about.spec.ts
✅	invariants: Person JSON-LD with jobTitle, knowsAbout, sameAs	1.3s
✅	structural snapshot	1.3s
✅	Person JSON-LD block snapshot	0.8s
✅	visual: full page	2.1s
	archive.spec.ts
✅	invariants: nav, canonical, post list non-empty	0.7s
✅	structural snapshot	0.7s
✅	visual: full page	2.1s
	home.spec.ts
✅	invariants: nav, footer social, JSON-LD types	0.7s
✅	structural snapshot	0.7s
✅	JSON-LD WebSite block snapshot	1.0s
✅	visual: full page	2.0s
	not-found.spec.ts
✅	invariants: nav present, title indicates not-found	0.6s
✅	structural snapshot	0.6s
✅	visual: full page	1.8s
	post.spec.ts
✅	invariants: BlogPosting + BreadcrumbList, canonical, og:image, description	1.5s
✅	structural snapshot	1.4s
✅	visual: above the fold	3.2s
	tag-page.spec.ts
✅	invariants: BreadcrumbList Home > Tags > Tag, description meta	0.7s
✅	structural snapshot	5.9s
✅	visual: above the fold	1.5s
	tags-index.spec.ts
✅	invariants: BreadcrumbList + CollectionPage with ItemList of all tags	0.6s
✅	structural snapshot	0.6s
✅	breadcrumb snapshot	0.6s
✅	visual: full page	1.6s

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