Sigil is not a HTML editor, it's an ebook editor. Or, to be correct, an ePub editor. You should be able to use the HTML you export from wherever in Sigil to create an ePub file, although you can only save as ePub, not as HTML. This is not a drawback, just drop that into Calibre and use it. Depending on your reading software (I see your device listed as Android), you'd need to convert it before sending it to your device.
Edit: Whether you need the additional files (what are those, anyway?) kind of depends on what files those are. Obviously, you'd need image files if there are any. I have absolutely no experience in this, but I think you can get by without CSS, although that might require some heavy reediting.
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