blog: migrate to the bilingual folder model

Each post is now a folder: meta.md (shared metadata) + one file per
language (fr.md / en.md) carrying the localized title and body.
Language files go where the existing prose actually is: hello-world
and hello-world-again are French, next is English. Share tokens
(8x6nki, szm8ld) move to meta.md so the unlisted /blog/d/ URLs keep
working; the post image stays in public/images (no move needed).

content/blog/hello-world-again.md → content/blog/hello-world-again/fr.md

 ---
 title: Hello World
-date: '2026-09-06'
-slug: hello-world-again
-description: Engine fixture — proves figure centering, build-time highlighting, tables. Prose to be written.
-draft: true
 ---
 
 Skeleton post. Each element below exercises one rendering path of the blog engine; prose comes later.

content/blog/hello-world-again/meta.md

+---
+title: Hello World
+date: '2026-09-06'
+description: Engine fixture — proves figure centering, build-time highlighting, tables. Prose to be written.
+draft: true
+---

content/blog/hello-world/fr.md

+---
+title: Hello World
+---
+
+> _C'est un petit pas pour l'homme, mais un grand pas pour le serverless._
+
+**Ceci n'est pas un premier post.**

content/blog/hello-world.md → content/blog/hello-world/meta.md

@@ -4,7 +4,3 @@ date: '2021-04-23'
 draft: true
 share: 8x6nki
 ---
-
-> _C'est un petit pas pour l'homme, mais un grand pas pour le serverless._
-
-**Ceci n'est pas un premier post.**

content/blog/next.md → content/blog/next/en.md

 ---
 title: NextJs Tutorial
-date: '2021-04-23'
-draft: true
-share: szm8ld
 ---
 
 Gotta say the [Vercel Next.JS Tutorial](https://nextjs.org/learn/basics/create-nextjs-app) was a delight to follow.

content/blog/next/meta.md

+---
+title: NextJs Tutorial
+date: '2021-04-23'
+draft: true
+share: szm8ld
+---