fall back to binder configuration files at the root, and move shiny tutorial...

fall back to binder configuration files at the root, and move shiny tutorial into its own folder and update badge url

.binder/.gitkeep

-

README.md

@@ -45,6 +45,6 @@ You need to follow some extra-steps:
 
 Click on the following badge to run the tutorial on binder, it will open a new tab in your browser and you can start the tutorial from there:
   
-[![Binder](https://mybinder.org/badge_logo.svg)](https://mybinder.org/v2/gh/jos4uke/shiny_tutorial.git/binder_test?urlpath=shiny/)
+[![Binder](https://mybinder.org/badge_logo.svg)](https://mybinder.org/v2/gh/jos4uke/shiny_tutorial.git/binder_test?urlpath=shiny/shiny_tutorial/)
   
 Be patient, it could take a while to deploy the tutorial code on mybinder.org.