Update app for Hugging Face

rules/formatting_rules.md

@@ -7,8 +7,8 @@ Adhere to the following page sequence when preparing your manuscript. Note that
 2.  **Copyright page**
 3.  **Approval page**
 4.  **Abstract**
-5.  **Preface, Foreword, and/or Acknowledgments** (optional)
-6.  **Table of Contents** (required)
+5.  **Table of Contents** (required)
+6.  **Preface, Foreword, and/or Acknowledgments** (optional)
 7.  **Lists of tables, illustrations, charts, figures, diagrams** (if applicable)
 8.  **Digital Manifest** (required for all digital projects)
 9.  **A Note on Technical Specifications** (required for all digital projects)