Removed broken links to Mixamo video tutorials

docs/modules/tutorials/nav.adoc

@@ -39,11 +39,6 @@
 ** How to Animate
 *** Mixamo
 **** xref:how-to/modeling/blender/mixamo.adoc[Blender Models]
-**** Video
-***** link:https://youtu.be/jHgAgTWIers?list=PLv6qR9TGkz8RcUr-fOHI2SksWA4BAU9TS[Part 1- Download Model]
-***** link:https://youtu.be/GQJSrOpNQwI?list=PLv6qR9TGkz8RcUr-fOHI2SksWA4BAU9TS[Part 2- Rig and Animate]
-***** link:https://youtu.be/JzRe2Dxbcmc?list=PLv6qR9TGkz8RcUr-fOHI2SksWA4BAU9TS[Part 3- Import to JME]
-***** link:https://youtu.be/8wwDRDJop7k?list=PLv6qR9TGkz8RcUr-fOHI2SksWA4BAU9TS[Part 4- Play Animation]
 ** xref:how-to/debugging.adoc[Debugging with Wireframes]
 ** xref:how-to/util/free_skymaps.adoc[How to create free skymaps]
 ** Java Tips