If other people will be reading this ebook, and it's not just for personal use, then I'd go with either preface or prologue. The definition of "Prologue" in the Merriam-Webster Dictionary is:
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The preface or introduction to a literary work.
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Epigraph might fit it better, but it's a little obscure and it might just confuse people.
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Eh, they'll find out when they click on it. And learn a new word in the process. Win-win!
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Normally, I'd agree with that but if the ToC is for the sake of conveniency, then I'd go with the term more people would be likely to recognize. That's just my opinion.