It would be nice if you could be more critical in your feedback; That way I can improve my writing in order to be more helpful.
Viewing post in Creating games in a single file
The tutorial expects you to be familiar with basic file management from an API.
It explains the process of appending all the resources required by a game to run (such as textures and scripts) to the game executable and then explains how they can be read back once written.
It is most applicable to be used when creating games without an engine, since most game engines do some form of resource packing already.
No, HTML is a completely different format to an executable, converting between them is impossible.
The closest thing would be creating an executable with a minimal web browser that simply loads an HTML document, which is similar to what frameworks such as Electron do. I'm against this for a number of reasons, personally, mainly because it introduces an unecessary amount of bloat.