Based on Chapter 1, describe the invocation to Lord Ganesha and why he is worshipped at the start of the book.

In Chapter 1 of the Sai Satcharitra, the author begins with a detailed invocation to Lord Ganesha for the successful and obstacle-free completion of writing the book. Ganesha is described with various epithets, including the "curved-trunk Heramba," "Lambodar" (large-bellied) because the fourteen worlds reside in his belly, and the "destroyer of the forest of obstacles." The text highlights that he holds a bright axe to destroy the obstacles of his devotees and is considered a "boat to cross the ocean of worldly existence." Ultimately, as Chapter 1 reveals, the author sees Sai Baba himself as the embodiment of Ganesha, stating that "this Sai himself is Ganesha Ganapati," who will take up the axe to destroy obstacles and bring forth divine knowledge.