RFC: Complete Project Rewrite with Docusaurus

[codayon]

I have initialized the Docusaurus project inside an orphan branch in my fork. Not sure, how can I create a draft PR.

I think the current branch should be renamed to legacy- and a new orphan branch should be created in this repository.

My branch: https://github.com/codayon/obk-website/tree/migration/hugo-to-docusaurus

Reference: OpenBangla/OpenBangla-Keyboard#396 (reply in thread)