general improvements to dockerfile and changing the cmd to the CLI version specified in the package

Dockerfile

+# Use the official Python image from the Docker Hub
 FROM python:3.12-slim
 
-# Set working directory
+# Set the working directory in the container
 WORKDIR /app
 
-# Copy the package files
-COPY . .
+# Copy the current directory contents into the container at /app
+COPY . /app
 
-# Install the package
+# Install pak
+RUN pip install --upgrade pip
 RUN pip install .
 
-# Command to run the package (adjust as needed)
-CMD ["python", "-c", "from pak.hello import hello; print(hello())"]
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+# Run hello when the container launches
+CMD ["hello"]
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