/monkeyd_crawl <url> [font_size] sets the body text size in points, half points
included, bounded to 6-24. Omitting it sends no size at all so the crawler's
default applies, rather than defining a second default here that could drift.
The document caption reports the size used.
Also advance the submodule to the lower 10pt default: on the 90x160mm phone
page that fits about 43 characters per line instead of 36.