Restructure build workflow into separate phases

[khaos-codi]

Restructure Workflow into Distinct Phases

This PR restructures the book build workflow into distinct, separate phases for better organization, clarity, and future maintainability.

New Structure:

1. Setup Phase:

   • Sets up version numbers and dates
   • Checks for cover image
   • Creates necessary directories
   • Passes outputs to subsequent jobs

2. Build Phase:

   • Prepares the build environment
   • Runs the build script with all-languages flag
   • Lists directory contents for debugging
   • Uploads build artifacts

3. Release Phase (main branch only):

   • Downloads artifacts
   • Creates GitHub release with all book formats
   • Uses metadata from the setup phase

4. Deploy Phase (main branch only):

   • Deploys to GitHub Pages
   • Depends on build and release phases

Benefits:

• Better Clarity: Each phase has a clear, distinct purpose
• Improved Visibility: More detailed logs of what is happening at each stage
• Build Once, Deploy Many: The build happens once, then the artifacts are used by subsequent jobs
• Future Flexibility: Makes it easier to add or modify specific phases without affecting others
• Enhanced Debugging: Added more logging steps to help with troubleshooting

The functionality remains the same, but the workflow is now more modular and easier to maintain.