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).
* Adapt theme
* Update Contents to match with new theme
* chore: few updates
* adapt HomePage
* Add icons and french version
* fix fr homepage
* Fix Netlab view
* Fix Netlab articles
* devpod post
* French version of DevPod
* my_first_lab
