Update Calculator-App.md

Sample calculation link is giving status 404 (does not exist).

Projects/1-Beginner/Calculator-App.md

@@ -58,6 +58,5 @@ number.
 - [Javascript Calculator](https://codepen.io/giana/pen/GJMBEv)
 - [React Calculator](https://codepen.io/mjijackson/pen/xOzyGX)
 - [Javascript-CALC](https://github.com/x0uter/javascript-calc)
-- [Sample Calculator](https://sevlasnog.github.io/sample-calculator)
 - [Python Calculator](https://github.com/kana800/Side-Projects/tree/master/1-Beginner/calculator)
 - [Swift - iOS Calculator](https://github.com/beacarlos/calculator)