DOC: make the index page nicer

Author: bsipocz

index.md

@@ -1,8 +1,27 @@
-# Recipes
+# Executable Tutorials
+
+
+## Example recipes
 
 ```{toctree}
-:maxdepth: 1
-:glob:
+---
+maxdepth: 1
+glob:
+caption: User tutorials
+---
+
 tutorials/**/*
+
+```
+
+
+## Contributing documentation
+
+```{toctree}
+---
+maxdepth: 1
+caption: Contributing
+---
+
 contributing
 ```