Move recent conferences from 'Upcoming' to 'Past' section

[colemilne54]

Summary

I've updated the docs by moving several conferences from the "Upcoming Conferences" section to the "Past Conferences" section.

Details

The following conferences were moved:

1. Reactathon 2023
2. RemixConf 2023
3. App.js Conf 2023
4. Chain React 2023
5. Render(ATL) 2023
6. React Summit 2023

Related Issues

This PR fixes issue #6088

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[github-actions]

Size changes

Details

📦 Next.js Bundle Analysis for react-dev

This analysis was generated by the Next.js Bundle Analysis action. 🤖

This PR introduced no changes to the JavaScript bundle! 🙌