Replace X badge with Bluesky and Mastodon badges (#167)

Author: alessandrofelder

README.md

@@ -10,7 +10,8 @@
 [![pre-commit](https://img.shields.io/badge/pre--commit-enabled-brightgreen?logo=pre-commit&logoColor=white)](https://github.com/pre-commit/pre-commit)
 [![Contributions](https://img.shields.io/badge/Contributions-Welcome-brightgreen.svg)](https://brainglobe.info/developers/index.html)
 [![Website](https://img.shields.io/website?up_message=online&url=https%3A%2F%2Fbrainglobe.info)](https://brainglobe.info/documentation/brainglobe-workflows/index.html)
-[![Twitter](https://img.shields.io/twitter/follow/brain_globe?style=social)](https://twitter.com/brain_globe)
+[![Bluesky](https://img.shields.io/badge/Bluesky-0285FF?logo=bluesky&logoColor=fff)](https://bsky.app/profile/brainglobe.info)
+[![Mastodon](https://img.shields.io/badge/Mastodon-6364FF?logo=mastodon&logoColor=fff)](https://mastodon.online/@brainglobe)
 
 # BrainGlobe Workflows