docs: remove dead projects
Neither of these addresses resolve:
* [SpringBoard](https://springboard.finance/)
* [Unk](https://unk.finance/)
@@ -14,8 +14,6 @@ Open a pull request to add your project to the [list](https://github.com/project
* [Cyclos](https://cyclos.io/)
* [Solend](https://solend.fi)
* [Drift](https://www.drift.trade/)
-* [SpringBoard](https://springboard.finance/)
-* [Unk](https://unk.finance/)
* [Fabric](https://stake.fsynth.io/)
* [Jet Protocol](https://jetprotocol.io/)
* [Quarry](https://quarry.so/)
