Implement Storage for Device Setup Instructions

[antoncxx]

Objective:

Create a database structure to store setup instructions for various device categories and types.

Requirements:

Support storing instructions for combinations of:

• Device Category (e.g., AppGuard Client, Firewall, Load Balancer)
• Device Type (e.g., Express.js, pfSense, etc.)

Instructions should support:

• Markdown or rich text format for formatting
• Versioning (optional but recommended for future updates)