feat: Add Docker startup script

- Adds a `start-docker.sh` script to simplify the process of
  building and running the application using Docker.
- Provides a convenient way to start the application without
  manual Docker commands.
- Includes an alternative configuration for direct port 80 usage.

start-docker.sh

@@ -0,0 +1,12 @@
+#!/bin/bash
+
+# Build the Docker image
+echo "Building Docker image..."
+docker build -t svelte-app .
+
+# Run the Docker container on port 80
+echo "Starting Docker container on port 80..."
+docker run -p 80:3000 svelte-app
+
+# Alternative: Set the container to use port 80 directly
+# docker run -p 80:80 -e PORT=80 -e HOST=0.0.0.0 svelte-app