docs: add installation guide link to README

Link to the full step-by-step install walkthrough on projectnomad.us/install,
placed below the Quick Install command for users who need Ubuntu setup help.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: 2 people

README.md

@@ -28,6 +28,8 @@ sudo apt-get update && sudo apt-get install -y curl && curl -fsSL https://raw.gi
 
 Project N.O.M.A.D. is now installed on your device! Open a browser and navigate to `http://localhost:8080` (or `http://DEVICE_IP:8080`) to start exploring!
 
+For a complete step-by-step walkthrough (including Ubuntu installation), see the [Installation Guide](https://www.projectnomad.us/install).
+
 ### Advanced Installation
 For more control over the installation process, copy and paste the [Docker Compose template](https://raw.githubusercontent.com/Crosstalk-Solutions/project-nomad/refs/heads/main/install/management_compose.yaml) into a `docker-compose.yml` file and customize it to your liking (be sure to replace any placeholders with your actual values). Then, run `docker compose up -d` to start the Command Center and its dependencies. Note: this method is recommended for advanced users only, as it requires familiarity with Docker and manual configuration before starting.