Add PostgreSQL book to docs/books

I was recently made aware of the page on the website that lists PostgreSQL books  in a discussion with Claire Geordano. I'd like to ask that the book that Grant Fritchey and I wrote and released earlier this year be added. An image of the cover is attached.

Thank you!

Ryan Booz

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Title: Introduction to PostgreSQL for the data professional

Author: Ryan Booz and Grant Fritchey

Language: English

Current PG version at publication: 17

Format: Paperback, eBook

Published date: February 3, 2025

Link or paperback: https://www.amazon.com/Introduction-PostgreSQL-data-professional-Ryan/dp/1036902374