Replace link to slides with a badge

Author: aobolensk

README.md

@@ -2,5 +2,4 @@
 
 [![License: CC BY 4.0](https://img.shields.io/badge/License-CC%20BY%204.0-lightgrey.svg)](https://creativecommons.org/licenses/by/4.0/)
 
-
-Slides for ITLab course: [Link](https://embedded-dev-research.github.io/itlab_slides/)
+[![Lecture Slides](https://img.shields.io/badge/Slides-View%20Online-brightgreen)](https://embedded-dev-research.github.io/itlab_slides/)