dx(platform): Add initial setup scripts for linux and windows (#9912)

This PR adds two setup scripts that will setup autogpt fully, it has a
windows .bat and a linux/mac .sh script, for now they are placed in a
new folder called "Installer"

### Note, the installers are supposed to be run outside of the autogpt
repo folder like Desktop/in a new empy folder because it will clone the
repo into the current directory.

I have had to add ``cross-env`` via ``pnpm add cross-env `` as on
windows the env is set differently in the ``package.json`` build section
``"build": "cross-env pnpm run generate:api-client &&
SKIP_STORYBOOK_TESTS=true next build"``

once fully setup i plan to make it so these commands can be run with the
following commands

Linux/Mac
```bash
curl -fsSL https://setup.agpt.co/install.sh -o install.sh && bash install.sh
```

Windows cmd/powershell
```bash
powershell -c "iwr https://setup.agpt.co/install.bat -o install.bat; ./install.bat"
```

Currently the commands above dont work but will later on!

### Checklist 📋

#### For code changes:
- [x] I have clearly listed my changes in the PR description
- [x] I have made a test plan
- [x] I have tested my changes according to the test plan:
- [x] I have tested the linux ``install.sh`` on a ubuntu system and it
setup the platform fully.
- [x] I have tested the windows ``install.bat`` on my windows system and
it setup the platform fully.
- [x] I have tested on both OS's and checked with missing prerequisites
to see if it shows the errors and it does

docs/content/platform/installer.md

@@ -0,0 +1,70 @@
+# AutoGPT Platform Installer
+
+The AutoGPT Platform provides easy-to-use installers to help you quickly set up the platform on your system. This page covers how to use the installer scripts for both Linux/macOS and Windows.
+
+## What the Installer Does
+
+The installer scripts will:
+
+1. Check for required prerequisites (Git, Docker, npm)
+2. Clone the AutoGPT repository
+3. Set up the backend services using Docker
+4. Set up the frontend application
+5. Start both the backend and frontend services
+
+## Prerequisites
+
+Before running the installer, make sure you have the following installed:
+
+- **Git**: For cloning the repository
+- **Docker**: For running the backend services
+- **Node.js and npm**: For the frontend application
+
+## Quick One-Liner Installation
+
+For convenience, you can use the following one-liner commands to install AutoGPT Platform:
+
+### Linux/macOS
+
+```bash
+curl -fsSL https://setup.agpt.co/install.sh -o install.sh && bash install.sh
+```
+
+### Windows
+
+```powershell
+powershell -c "iwr https://setup.agpt.co/install.bat -o install.bat; ./install.bat"
+```
+
+## Manual Installation
+
+If you prefer, you can manually download and run the installer scripts:
+
+- **Linux/macOS:** `setup-autogpt.sh`
+- **Windows:** `setup-autogpt.bat`
+
+Follow the instructions in the [installer README](../../../../autogpt_platform/installer/README.md) for more details.
+
+## After Installation
+
+Once the installation is complete:
+- The backend services will be running in Docker containers
+- The frontend application will be available at http://localhost:3000
+
+## Stopping the Services
+
+To stop the services, press Ctrl+C in the terminal where the frontend is running, then run:
+
+```bash
+cd AutoGPT/autogpt_platform
+docker compose down
+```
+
+## Troubleshooting
+
+If you encounter any issues during installation:
+
+1. Make sure all prerequisites are correctly installed
+2. Check that Docker is running
+3. Ensure you have a stable internet connection
+4. Verify you have sufficient permissions to create directories and run Docker