[Enhancement] Move documentation from blog to github

[Silverdev2482]

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Description

I have been struggling to set this mod up. I find the blog visually cluttered, making it slightly harder to find what I want.

[Xujiayao]

I agree with your opinion. I will rewrite and move the docs to a separate subdomain of xujiayao.com instead of GitHub, and it will not use the same theme as the blog.