my bad, I thought it worked without the extra strings, but I guess when
I tested it, the chapter cache was stale. Even with debugging tools,
Android is pain.
Not all pages have accompanying text, but it's nice to be able to see
the text when there is some. Examples are `No Comic (03/14/22)` and
`Meidri (Interspecies Reviewers)`
This is done in a nearly identical way to the xkcd source's alt-text
pages, with nearly identical code.
Also handle the extremely rare case where there are multiple images for
the same page. The only instance I can recall is `Page 23+24`
