Add comprehensive first batch of documentation for Cosmify

[Copilot]

Description

Created foundational documentation covering installation, deployment workflow, architecture, and production configuration for the Cosmify self-hosted PaaS platform.

Documentation Structure

Getting Started

• Introduction: Platform overview, feature set, architecture summary, target use cases
• Installation: Docker Compose and manual setup methods with system requirements, post-install configuration, and troubleshooting
• Quick Start: 7-step deployment tutorial from organization creation through container deployment with Nginx example

Core Concepts

• Overview: Architecture diagram, component hierarchy (Organizations → Projects → Containers), resource model, data flow, and security model

Guides

• Configuration: Environment variables, Docker Compose examples, Nginx reverse proxy setup, production hardening (SSL, backups, firewall), monitoring configuration

Key Content

# Example: Deploy Nginx container
Name: web-server
Image: nginx:latest
Port Mapping:
  - Container: 80
  - Host: 8080

Architecture layers:

Frontend (Vue.js, :3000) → Backend (Express.js, :3001) 
  → PostgreSQL (:5432) → Managed Servers (SSH/Docker)

Updated nuxt.config.ts to prerender all new documentation routes.

Related Issues

Addresses request to create initial documentation batch for cosmify-dev/cosmify product.

Checklist

• My code follows the project's coding style.
• I have performed a self-review of my code.
• I have tested my changes locally.
• My changes do not introduce any new warnings or errors.

Screenshots (if applicable)

Before:

After - Introduction:

Installation Guide:

Quick Start:

Additional Notes

• 1,173 lines of documentation across 6 files
• 25+ ready-to-use code examples
• Build verified, CodeQL clean
• Cross-referenced navigation between related topics

Original prompt

Please write the first batch of documentation for the cosmify-dev/cosmify product

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✨ Let Copilot coding agent set things up for you — coding agent works faster and does higher quality work when set up for your repo.

[undefinedhuman]

This is useless because it will be added via the Description in the metadata

[undefinedhuman]

Remove this

[undefinedhuman]

This for Development not production usage

[undefinedhuman]

This is done via migrations