Add GitHub org migration notice and remove co-authors placeholder

Author: fabriziocucci

website/blog/2026-06-10-react-native-0.86.mdx

@@ -13,6 +13,12 @@ This release includes comprehensive edge-to-edge support on Android 15+ and perf
 
 Following 0.83, this is the second React Native release with no user-facing breaking changes, reflecting our continued commitment to making upgrades more predictable and seamless.
 
+:::info
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+As part of this release, the React, React Native, Metro, Yoga and React Native Website repositories are moving from the `facebook` GitHub organization to the `react` organization. GitHub will automatically redirect all existing URLs, issues and PRs to the new location.
+
+:::
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 ### Highlights
 
 - [Edge-to-Edge on Android](/blog/2026/06/10/react-native-0.86#edge-to-edge-on-android)