Remove numeric prefix from materials dir

Author: mfisher87

02-schedule.md

@@ -11,7 +11,7 @@ AGU!
 | Time      | Duration    | Topic                                                                               | Presenter(s)      |
 |-----------|-------------|-------------------------------------------------------------------------------------|-------------------|
 | 8:30 AM   | 10 minutes  | Meet the instructors                                                                | All               |
-| 8:40 AM   | 45 minutes  | [](04-materials/01-working-in-jupyterhub/CryoCloud_demo.ipynb)                      | Tasha             |
+| 8:40 AM   | 45 minutes  | [](materials/01-working-in-jupyterhub/CryoCloud_demo.ipynb)                         | Tasha             |
 | 9:25 AM   | ?? minutes  | ................................................................................... | ................. |
 | .......   | ..........  | ................................................................................... | ................. |
 

04-materials/00-slides.md renamed to materials/00-slides.md

@@ -15,7 +15,7 @@ project:
     - pattern: "0*.md"
     - title: "Materials"
       children:
-        - file: "04-materials/01-working-in-jupyterhub/CryoCloud_demo.ipynb"
+        - file: "materials/01-working-in-jupyterhub/CryoCloud_demo.ipynb"
 
 
 site: