Update SUMMARY.md

Author: MauroToscano

docs/SUMMARY.md

@@ -1,28 +1,29 @@
-# Introduction
+# Summary
+## Introduction
 
 * [What is Aligned?](introduction/0_what_is_aligned.md)
 * [Getting started](introduction/1_getting_started.md)
 * [FAQ](introduction/2_faq.md)
 * Core concepts
 * Use cases
 
-# Guides
+## Guides
 
 * [Submitting with every proving system](guides/0_proving_systems.md)
 * [Operators guide](guides/1_operator_guide.md)
 * Making your own app with Aligned
 
-# Architecture
+## Architecture
 
 * Fast mode
 * Aggregation mode
 
-# Useful links 
+## Useful links 
 
 * [All the proof aggregation solutions will use RISC-V zkvms](https://blog.alignedlayer.com/all-the-proof-aggregation-solutions-will-use-risc-v-zkvms/)
 * [Manifesto](https://blog.alignedlayer.com/aligned_manifesto/)
 
-# Contacts
+## Contacts
 
 * [Telegram Group](https://t.me/aligned_layer)
 * [Twitter/X](https://twitter.com/alignedlayer)