edited about page

Twitter/X links were replaced by BlueSky and Mastodon links.

Author: JoramSoch

about.md

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-**The Book of Statistical Proofs** is [a project](https://de.wikiversity.org/wiki/Wikiversity:Fellow-Programm_Freies_Wissen/Einreichungen/The_Book_of_Statistical_Proofs) within the *Wikimedia Fellowship Programme*, also known as the "[Fellow-Programm Freies Wissen](https://de.wikiversity.org/wiki/Wikiversity:Fellow-Programm_Freies_Wissen)", and received 5,000 € of funding within the 2019-2020 cohort. This website is [generated from a public repository](https://github.com/StatProofBook/StatProofBook.github.io) and everyone is [welcome to contribute](/contribute/). Please [follow us on X](https://twitter.com/StatProofBook) to stay up to date on new developments and [new proofs being added](https://twitter.com/search?q=%23NewProof&f=live) to the archive or [random proofs being shared](https://twitter.com/search?q=%23RandomProof&f=live). For more information, see the [Wikidata entry](https://www.wikidata.org/wiki/Q124358310) on the StatProofBook.
+**The Book of Statistical Proofs** is [a project](https://de.wikiversity.org/wiki/Wikiversity:Fellow-Programm_Freies_Wissen/Einreichungen/The_Book_of_Statistical_Proofs) within the *Wikimedia Fellowship Programme*, also known as the "[Fellow-Programm Freies Wissen](https://de.wikiversity.org/wiki/Wikiversity:Fellow-Programm_Freies_Wissen)", and received 5,000 € of funding within the 2019-2020 cohort. This website is [generated from a public repository](https://github.com/StatProofBook/StatProofBook.github.io) and everyone is [welcome to contribute](/contribute/). Please follow us on [BlueSky](https://bsky.app/profile/statproofbook.bsky.social) or [Mastodon](https://mastodon.social/@StatProofBook) to stay up to date on new developments. For more information, see the [Wikidata entry](https://www.wikidata.org/wiki/Q124358310) on the StatProofBook.
 
 "The Book of Statistical Proofs" is maintained by *Joram Soch* ([ORCID](https://orcid.org/0000-0002-8879-5666), [GitHub](https://github.com/JoramSoch), [X](https://twitter.com/JoramSoch)).