readme: Remove broken link

The docs directory doesn't exist, nor is the linked file somewhere else in this repo. As such I've removed the link in favour of linking to the generic GitHub issue tracker.

README.md

@@ -209,11 +209,7 @@ If you want to support the development of this project, you could consider buyin
 
 [![Support via PayPal.me](assets/paypal_button.svg)](https://www.paypal.me/oldrev)
 
-## Known Issues
-
-Please refer to [ISSUES.md](docs/ISSUES.md) for a list of known issues and workarounds.
-
-## Feedback and Support
+## Issues, Feedback and Support
 
 We welcome your feedback! If you encounter any issues or have suggestions, please open an [issue](https://github.com/edge-link/edgelink/issues).