Add a PDF conversion script

[shaunyogeshwaran]

Is your feature request related to a problem? Please describe

There is currently no way to generate a PDF version of the Wave documentation. This can be a significant limitation for users in airgapped environments who need offline access to the docs.

Describe the solution you'd like

Introduce a script that converts the full Wave documentation into a single, well-formatted PDF. This script should be easy to run and generate updated PDFs as the docs evolve.