parsePageTemplate parsed the page file before htmlheader.html. A later
definition of a template name replaces an earlier one (an empty one
never does), so htmlheader.html's {{block "title"}} replaced every
page's {{define "title"}} and every tab read "Webhooker". The page file
is now parsed last, into a set named after it, so it stays the entry
point.
A new test renders every page template and checks its title; the
"Webhooker" fallback is checked on htmlheader.html alone, since every
page declares a title.
Model: opus-5-5
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