Update TOC

Author: karengu0

articles/firmware-analysis/toc.yml

@@ -1,18 +1,28 @@
-items:
-  - name: Firmware analysis
+- name: Firmware analysis
+  - name: Overview
     items:
     - name: Overview of Firmware analysis
       href: overview-firmware-analysis.md
-    - name: Tutorial using Firmware analysis with the Azure portal
-      href: tutorial-analyze-firmware.md
-    - name: Firmware analysis role-based access control
-      href: firmware-analysis-rbac.md
+    - name: Firmware analysis frequently asked questions
+      href: firmware-analysis-faq.md
+  - name: Quickstarts
+    items:
     - name: Quickstart to use Firmware analysis with Azure CLI
       href: quickstart-upload-firmware-using-azure-command-line-interface.md
     - name: Quickstart to use Firmware analysis with Azure PowerShell
       href: quickstart-upload-firmware-using-powershell.md
     - name: Quickstart to use Firmware analysis with a Python script
       href: quickstart-upload-firmware-using-python.md
-    - name: Firmware analysis frequently asked questions
-      href: firmware-analysis-faq.md
+  - name: Tutorial using Firmware analysis with the Azure portal
+    href: tutorial-analyze-firmware.md
+  - name: Concepts
+    items:
+    - name: Firmware analysis role-based access control
+      href: firmware-analysis-rbac.md
+  - name: How-to guides
+    items:
+    - name: Automate firmware analysis using service principals
+      href: automate-firmware-analysis-service-principals.md
+    - name: Interpreting extractor paths from analysis results
+      href: interpreting-extractor-paths.md