Merge pull request #260903 from vinnieangel/organizingtoc

updated toc

Author: American-Dipper

articles/education-hub/toc.yml

@@ -2,14 +2,22 @@
   href: ./index.yml
 - name: Overview 
   items:
-  - name: What is the Education Hub?
-    href: about-education-hub.md
-  - name: What is Azure Dev Tools for Teaching?
-    href: azure-dev-tools-teaching/about-program.md
-  - name: What is Azure for Students?
-    href: about-azure-for-students.md
-  - name: What is Azure for Students Starter?
-    href: about-azure-for-students-starter.md
+  - name: Azure for Students
+    items:
+    - name: What is Azure for Students?
+      href: about-azure-for-students.md
+  - name: Azure for Students Starter
+    items:
+    - name: What is Azure for Students Starter?
+      href: about-azure-for-students-starter.md
+  - name: Education Hub
+    items:
+    - name: What is the Education Hub?
+      href: about-education-hub.md
+  - name: Azure Dev Tools for Teaching
+    items:
+    - name: What is Azure Dev Tools for Teaching?
+      href: azure-dev-tools-teaching/about-program.md
 - name: Quickstarts
   items:
   - name: Access the Education Hub