Although Sigil can add existing html/xhtml to an empty epub these are from files typically located on your local machine. Have you tried saving the website as an offline archive with your desktop machine browser? Alternatively command line programs like curl can be used to grab websites as well.
The problem is most websites are loaded with active page elements via javascript that can be a pain to unravel and clean up not to mention crap like remote advertising and tracking.
Properly cleaning this up would be a headache for something that is only going to be read once.
Have you checked to see if your e-reading device supports a browser? If so that may be a better solution for short term reading.
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