use Next.js instead of Docusaurus

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Docusaurus is a great framework to generate static website, but it still has some limitations:

• pages should be statically generated in build time, it's dirty to implement a dynamic page like analyze and collections
• it's impossible to add SEO info and og meta tags in dynamic pages, which would impact sharing preview on other websites #396
• it's difficult to use runtime environment to change some config like API base url. #438
• it's difficult to inject css-in-js generated css codes in built bundle, which will cause styling issue when js was not executed

I think we should use Next.js instead of docusaurus in future.

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Updated 2023-08-21

We are now start to migrate OSSInsight front end project to Next.js step by step. Before all functions are finished, next.ossinsight.io will be the temporary domain for the Next.js version OSSInsight.

• [ ] (New Feature) Widgets
• [ ] Analyze Repository
• [ ] Analyze Developer
• [ ] (New Feature) Analyze Org
• [ ] Collections
• [ ] Blogs and articles