Rewrite routes for i18n for sub-sites (e.g. /docs)

[softmarshmallow]

Currently we do not have any sort of localization, except the docs-site.

Docs site is hosted under docs.grida.co/docs (with base path /docs), made with docusaurus, and it does support i18n.

The problem

Problem being, the i18n routing for subsites works in a separated way.

Now

• https://grida.co/docs/ko/
• https://grida.co/docs/ko/getting-started/intro

Should be

• https://grida.co/ko/docs/
• https://grida.co/ko/docs/getting-started/intro

References

• https://nextjs.org/docs/api-reference/next.config.js/rewrites
• https://nextjs.org/docs/advanced-features/i18n-routing