docs(translations): Setup crowdin configuration for new astro doc site

[lwasser]

@flpm is working on this actively

This involves initial setup of the documentation translation infrastructure that syncs Crowdin and reconnects translated files with the new directory structure that Astro/Starlight creates.

• update CrowdIn file structure (in the CrowdIn website) to match the new Astro folder structure to preserve translations
• rewrite CrowdIn configuration file
• initial download of current translations to check into the repo