Update Docusaurus to 1.9.0

[yangshun]

Summary

• Update Docusaurus to 1.9.0
• Enable collapsible side bar
• Clean up some hrefs that were pointing to .html extensions. This should have been done when the cleanUrl option was enabled but it still works because we generate both /path/index.html and /path.html in v1. This will break in v2 so better change it now.
• Enable the scroll-to-top button

[react-native-bot]

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Changes to docs/ are reflected in the next "master" version.

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_{How to Contribute • Documentation Sources}

[rickhanlonii]

Whaaaat, thanks @yangshun!

[cpojer]

Thanks so much @yangshun, this is so much better :)

I'm wondering if there is a way to split up the Docs and API pages into two separate top-level entry points both with their own sidebars? For Docs, it should only have the Guides sections and for API it should have the Components and API sections. Is this possible?

[charpeni]

Thank you, @yangshun!

[yangshun]

Welcome! I'm always available to answer any Docusaurus-specific questions. Cheers! 🎉

I'm wondering if there is a way to split up the Docs and API pages into two separate top-level entry points both with their own sidebars? For Docs, it should only have the Guides sections and for API it should have the Components and API sections. Is this possible?

I think it should be. I'll look into that.

[cpojer]

I just noticed that this also collapses the sidebar in the blog section. Is it possible to always expand it there?

[yangshun]

This is a limitation of the collapsible sidebar. I'll modify Docusaurus core to not collapse for blogs.

[yangshun]

PR for the fix in facebook/docusaurus#1519. Will update RN website when that PR is merged.