notes.

chapter_1.md
 - Introduction

chapter_2.md
 - Hardware
   - Requirements
     - Prototyping components
   - GPIO pinout

chapter_3.md
 - Software
   - Operating system
     - Development environment setup
       - Rust compiler
   - Microservices
     - Overview / architecture
     - peach-buttons
     - peach-menu
     - peach-network
     - peach-oled
     - peach-stats
   - Configuration
   - Interfaces
     - Physical interface
     - Web interface
       - peach-web

chapter_5.md
 - Contributors guide

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appendices:

 - Licenses