Update free-programming-cheatsheets.md

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more/free-programming-cheatsheets.md

@@ -143,7 +143,6 @@
 
 ### Dart
 
-* [Dart Cheatsheet](https://quickref.me/dart) - Quickref.me (HTML)
 * [Dart Cheatsheet](https://dart.dev/codelabs/dart-cheatsheet) - Codelabs (HTML)
 * [Dart Cheatsheet](https://simplecheatsheet.com/tag/dart-cheat-sheet/#site-header) - Simplecheatsheet.com (HTML)
 * [Dart Quick Reference](https://koenig-media.raywenderlich.com/uploads/2019/08/RW-Dart-Cheatsheet-1.0.2.pdf) - Koenig-media.raywenderlich.com (PDF)
@@ -585,7 +584,6 @@
 ### Rust
 
 * [Rust Cheat Sheet](https://zerotomastery.io/cheatsheets/rust-cheat-sheet/) - ZeroToMastery (HTML)
-* [Rust cheatsheet](https://quickref.me/rust) - QuickRef.ME (HTML)
 * [Rust Language Cheat Sheet](https://cheats.rs) (HTML)