Split up dask material (#79)

* Split up dask material

* close cluster

Author: dcherian

_toc.yml

@@ -21,10 +21,10 @@ parts:
   - caption: Intermediate
     chapters:
       - file: intermediate/01-high-level-computation-patterns
-
+      - file: intermediate/xarray_and_dask
   - caption: Advanced
     chapters:
-      - file: advanced/xarray_and_dask
+      - file: advanced/parallelize-custom-functions
 
   - caption: Workshops
     chapters: