html.duckduckgo.com captchas all my IPs very fast. I figured out that using
duckduckgo.com works even if html.duckduckgo.com is captcha-ed, hence adding
support for duckduckgo.com's general web search here.
This implementation fetches the link to the first API page
(i.e. ``links.duckduckgo.com/d.js?...``) from duckduckgo.com and uses the ``n``
parameter of the API to fetch all subsequent pages.
This also means that it's not possible to immediately search for the third
page - the first and the second page would need to be loaded first.
The reason why we can't just normally use the `vqd` value is that the API URLs
require an additional parameter `dp` which seems generated at server-side, so we
can't build it ourselves and must scrape it from the HTML pages.
Bnyro