v1.61.7

Fixed

• On a phone, the header could stutter while scrolling a short page. Collapsing the large title gives its space back to the content below it, and on a page with only a little to scroll that was enough to bounce the page back to the top, which reopened the header, which made it scrollable again. The header now stays put unless there is genuinely enough to scroll. Reported on GitHub (#53).