[Docs]: Internationalization

Description

It was created based on #1386 that was suspended.

Hm, I'd like to hold off from translating docs until I have bit more free time. The docs are bound to change a lot since we just released v3 so I don't think it's a smart idea to start now either. Can you open a new issue instead? Should also figure out what's the best approach to organizing and serving content too.

Originally posted by @pilcrowonpaper in #1386 (comment)

hi @pilcrowonpaper
I have created a demo of the documentation for multiple languages.
Give it a try.

cd docs
pnpm i
pnpm build

By super simple method like:

#!/bin/sh
rm -rf ./dist
malta build
cd translations/ja
malta build
cp -r ./dist/ja ../../dist