Configure Hugo multilingual mode (fr default, en secondary) with
Hextra's language-switch menu entry, and translate all existing
content pages to English using Hugo's per-file language suffix
convention (.en.md alongside .fr.md).
This commit adds the French blog section and the first article
describing the author's personal infrastructure setup using Gitea,
Scaleway, and other tools. It covers topics like self-hosting, hybrid
cloud, and network engineering.
