The other one by Cecilbrews is a little more advanced, but that's mostly because it has a lot more of its navigation elements in a dropdown. At its core, it's basically the same thing, just not caring to break up each web page by image and instead by episode:
Inspect is your friend for figuring out how to work specific elements. Just take it element-by-element for learning; the iframe and associated document involve nesting html within html, so anything above that is just itch's page rather than the comic.
Anyway, dissertation aside, here's a very basic page layout that you can bum:
<html>
<head><head>
<body>
<center>
<a href="previousPage.html">Previous page text or image goes here</a>
<a href="nextPage.html">Next page text or image goes here</a>
<img src="COMIC_PAGE_1.jpg"/>
</center>
</body>
</html>
Replace the content in each a element's href tag and the img's src tags as needed for each specific page.
The biggest pain is going to be managing your image sizes, since you need to account for all readers. You're going to be dealing with desktop users besides mobile. So, if your panels/pages are smaller than a player, you might need to implement some size limitations (such as what Temmie's pages do). For this example, I just left it at an un-filtered size and made the test image so big that it doesn't matter.
End result:
Hope something in that rambling helps.
