chore(docs): Refactor website

https://www.figma.com/file/NhivUnyyqqv09UnvhFLjKA/envd?node-id=0%3A1&t=bCVhBwIiBACZ63JD-0

We have an elegant design from @shaonianche, and we can refactor the https://envd.tensorchord.ai/ to the new design.