E_NO_PAGE_FUNC
page.go has no Page function
The scanner found page.go but no `func Page(c *trilha.Ctx) (h.Node, error)` in it, so the route has nothing to answer with.
Conserto
Name the handler Page, or rename the file if it is not a page.
func Page(c *trilha.Ctx) (h.Node, error) { return h.Div(), nil }