Remove dead kanban link

Author: RoyPrinsGH

README.md

@@ -25,7 +25,6 @@
 * [Concepts](docs/concepts/README.md)
 * [Examples](examples/README.md)
 * [Development Guide](DEVELOPMENT.md)
-* [Kanban Board](https://github.com/Sollimann/b3/projects/1)
 * [Honorable Mentions](#similar-crates)
 
 ## Using Bonsai