chore(docs) : update installation optional parameters to pass in to the installation script

Author: raghavyuva

docs/install/index.md

@@ -5,7 +5,31 @@ Welcome to the Nixopus installation guide. This section will help you set up Nix
 To install Nixopus on your VPS, ensure you have sudo access and run the following command:
 
 ```
-curl -sSL https://raw.githubusercontent.com/raghavyuva/nixopus/refs/heads/master/scripts/install.sh | sudo bash
+sudo bash -c "$(curl -sSL https://raw.githubusercontent.com/raghavyuva/nixopus/refs/heads/master/scripts/install.sh)"
 ```
 
-> **Note**: The installation script has not been tested in all distributions and different operating systems. If you encounter any issues during installation, please create an issue on our [GitHub repository](https://github.com/raghavyuva/nixopus/issues) with details about your environment and the error message you received.
+## Optional Parameters
+
+You can customize your installation by providing the following optional parameters:
+
+- `--api-domain`: Specify the domain where the Nixopus API will be accessible (e.g., `nixopusapi.example.tld`)
+- `--app-domain`: Specify the domain where the Nixopus app will be accessible (e.g., `nixopus.example.tld`)
+- `--email` or `-e`: Set the email for the admin account
+- `--password` or `-p`: Set the password for the admin account
+
+Example with optional parameters:
+```
+sudo bash -c "$(curl -sSL https://raw.githubusercontent.com/raghavyuva/nixopus/refs/heads/master/scripts/install.sh)" -- \
+  --api-domain nixopusapi.example.tld \
+  --app-domain nixopus.example.tld \
+  --email [email protected] \
+  --password Adminpassword@123 \
+  --env production
+```
+
+## Accessing Nixopus
+
+After successful installation, you can access the Nixopus dashboard by visiting the URL you specified in the `--app-domain` parameter (e.g., `https://nixopus.example.tld`). Use the email and password you provided during installation to log in.
+
+> **Note**: The installation script has not been tested in all distributions and different operating systems. If you encounter any issues during installation, please create an issue on our [GitHub repository](https://github.com/raghavyuva/nixopus/issues) with details about your environment and the error message you received.
+