resource moved to playgrounds

more/free-programming-interactive-tutorials-en.md

@@ -1,7 +1,6 @@
 ### Index
 
 * [Ada](#ada)
-* [Algorithms](#algorithms)
 * [Android](#android)
 * [Bash](#bash)
 * [C](#c)
@@ -59,11 +58,6 @@
 * [Introduction to Ada](https://learn.adacore.com/courses/intro-to-ada/index.html) - Adacore
 
 
-### Algorithms
-
-* [Data Structures Visualization](https://www.cs.usfca.edu/~galles/visualization/Algorithms.html) - David Galles
-
-
 ### Android
 
 * [Android Tutorial](https://www.tutlane.com/tutorial/android) - tutlane