refactor(kits): update CI/CD workflows and add README

- Change workflow icon to 📦 (package)
- Update dev workflow to deploy via SSH to dev repo
- Use DEV_KITS_PATH variable for consistency
- Add README.md with quick start and directory structure

kits/README.md

@@ -0,0 +1,94 @@
+# Hardware Kits
+
+*Hands-on embedded ML labs for the MLSysBook*
+
+[![Build](https://img.shields.io/github/actions/workflow/status/harvard-edge/cs249r_book/kits-publish-dev.yml?branch=dev&label=Build&logo=githubactions)](https://github.com/harvard-edge/cs249r_book/actions/workflows/kits-publish-dev.yml)
+[![Website](https://img.shields.io/badge/Read-mlsysbook.ai/kits-blue)](https://mlsysbook.ai/kits)
+
+This directory contains hands-on embedded ML labs using Arduino, Raspberry Pi, and other microcontroller platforms.
+
+**[Read Online](https://mlsysbook.ai/kits)** | **[PDF](https://mlsysbook.ai/kits/assets/downloads/Hardware-Kits.pdf)**
+
+---
+
+## Platforms
+
+| Platform | Description |
+|----------|-------------|
+| **Arduino Nicla Vision** | Compact AI camera board with STM32H7 |
+| **Seeed XIAO ESP32S3** | Tiny ESP32-S3 with camera support |
+| **Grove Vision AI V2** | No-code AI vision module |
+| **Raspberry Pi** | Full Linux SBC for edge AI |
+
+---
+
+## Quick Start
+
+```bash
+# Build HTML site
+cd kits
+ln -sf config/_quarto-html.yml _quarto.yml
+quarto render
+
+# Build PDF
+ln -sf config/_quarto-pdf.yml _quarto.yml
+quarto render --to titlepage-pdf
+
+# Preview with live reload
+quarto preview
+```
+
+---
+
+## Directory Structure
+
+```
+kits/
+├── contents/                # Lab content
+│   ├── arduino/             # Arduino Nicla Vision labs
+│   ├── seeed/               # Seeed XIAO & Grove Vision labs
+│   ├── raspi/               # Raspberry Pi labs
+│   └── shared/              # Shared resources (DSP, features)
+├── assets/                  # Images, styles, scripts
+├── config/                  # Quarto configurations
+│   ├── _quarto-html.yml     # Website config
+│   └── _quarto-pdf.yml      # PDF config
+├── tex/                     # LaTeX includes for PDF
+├── filters/                 # Lua filters
+└── index.qmd                # Landing page
+```
+
+---
+
+## Labs Overview
+
+Each platform includes labs covering:
+
+- **Setup** - Hardware setup and environment configuration
+- **Image Classification** - CNN-based image recognition
+- **Object Detection** - Real-time object detection
+- **Keyword Spotting** - Audio wake word detection
+- **Motion Classification** - IMU-based gesture recognition
+
+---
+
+## Related
+
+- **[MLSysBook](../README.md)** - Main textbook
+- **[TinyTorch](../tinytorch/)** - Build ML frameworks from scratch
+- **[Website](https://mlsysbook.ai/kits)** - Read labs online
+
+---
+
+## Authors
+
+- **Marcelo Rovai** - Primary author
+- **Vijay Janapa Reddi** - Harvard University
+
+---
+
+## License
+
+Content is licensed under **Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International** (CC BY-NC-SA 4.0).
+
+See [LICENSE.md](../LICENSE.md) for details.