Better structure

Author: joelsa

src/SUMMARY.md

@@ -1,8 +1,19 @@
 # Summary
 
+- [Getting Started With Embedded Rust 📟🦀](./index.md)
 - [Introduction](./introduction.md)
-- [Setup](./setup.md)
+    - [Setup](./setup.md)
+
+---
+
+# Exercises
+
 - [First Exercise](./exercise1.md)
 - [Second Exercise](./exercise2.md)
+
+---
+
+# Final Words
+
 - [Wrap-up](./wrapup.md)
 

src/index.md

@@ -0,0 +1 @@
+# Getting Started With Embedded Rust 📟🦀

src/introduction/setup.md

@@ -0,0 +1 @@
+# Setup