Remove Twitter links from admin list

Co-Authored-By: Kate Gregory <4205167+KateGregory@users.noreply.github.com>

Author: claremacrae

index.md

@@ -16,7 +16,7 @@ We believe that a community is only as good as how it treats its most vulnerable
 
 Our primary communication platform is our [Discord server](/discord/). Join us to discuss and learn C++ in a welcoming, inclusive space.
 
-The moderation and administration team includes [Sy Brand](https://twitter.com/TartanLlama), [Noam Chitayat](https://twitter.com/_Noam), [Kate Gregory](https://twitter.com/gregcons), [Adi Shavit](https://twitter.com/AdiShavit), [Fred Tingaud](https://twitter.com/FredTingaudDev).
+The moderation and administration team includes Sy Brand, Noam Chitayat, Kate Gregory, Adi Shavit, and Fred Tingaud.
 
 Everyone who supports our goals, whether a member of any under-represented groups or not, is welcome to participate in any way - see [What can I do?](/what-can-i-do/) Many of our leaders and contributors are allies and we are grateful for all they do. If you want C++ to be more welcoming and inclusive, you'll be welcomed and included.