docs: Update twitter links in introducing-docusaurus blog post (faceb…

…ook#10503)

website/blog/2017/12-14-introducing-docusaurus.mdx

@@ -129,11 +129,11 @@ build
 
 ![](/img/docusaurus.svg)
 
-We welcome your [contributions](https://github.com/facebook/docusaurus/blob/master/CONTRIBUTING.md) to Docusaurus, whether you want to use it for your own site, you want to [contribute](https://github.com/facebook/docusaurus/blob/master/CONTRIBUTING.md) to the Docusaurus core or just have questions. Follow us on [GitHub](https://github.com/facebook/docusaurus) and [Twitter](https://twitter.com/docusaurus).
+We welcome your [contributions](https://github.com/facebook/docusaurus/blob/master/CONTRIBUTING.md) to Docusaurus, whether you want to use it for your own site, you want to [contribute](https://github.com/facebook/docusaurus/blob/master/CONTRIBUTING.md) to the Docusaurus core or just have questions. Follow us on [GitHub](https://github.com/facebook/docusaurus) and [X (formerly Twitter)](https://x.com/docusaurus).
 
 ## Acknowledgements
 
-Docusaurus wouldn't exist without the work of the rest of the core Docusaurus team: [Eric Nakagawa](http://twitter.com/ericnakagawa), [Hector Ramos](https://twitter.com/hectorramos), [Eric Vicenti](https://twitter.com/EricVicenti) and [Frank Li](https://github.com/deltice) — a former intern at Facebook who implemented the core technology and features.
+Docusaurus wouldn't exist without the work of the rest of the core Docusaurus team: [Eric Nakagawa](http://x.com/ericnakagawa), [Hector Ramos](https://x.com/hectorramos), [Eric Vicenti](https://x.com/EricVicenti) and [Frank Li](https://github.com/deltice) — a former intern at Facebook who implemented the core technology and features.
 
 Special thanks also goes out to our earliest [adopters](https://v1.docusaurus.io/en/users.html) of Docusaurus:
 
@@ -151,6 +151,6 @@ Without their dedication to creating or migrating their websites over to the pla
 ## Resources
 
 - [Read our documentation](https://v1.docusaurus.io)
-- [Follow our Twitter feed](https://twitter.com/docusaurus)
+- [Follow our X (formerly Twitter) feed](https://x.com/docusaurus)
 - [Follow us on GitHub](https://github.com/facebook/docusaurus)
 - [About Slash, the Docusaurus mascot](https://v1.docusaurus.io/about-slash.html)