Update README.md

Author: thibaudcolas

team/README.md

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 # Wagtail accessibility team
 
 Use this folder for documents relating to the [Accessibility team](https://github.com/wagtail/wagtail/wiki/Accessibility-team).
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-## Team reports
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-- 2023-12-13: [Wagtail accessibility in 2023 and beyond](https://wagtail.org/blog/wagtail-accessibility-in-2023-and-beyond/).
-- 2023-05-15: [Wagtail accessibility statistics for GAAD 2023](https://wagtail.org/blog/wagtail-accessibility-statistics-for-gaad-2023/).
-- 2022-02-28: [State of Wagtail’s accessibility](https://wagtail.org/blog/state-of-wagtail-accessibility/).
-- 2021-02-24: [Accessibility team reloaded](https://wagtail.org/blog/accessibility-team-reloaded/).