The implementation uses the Qwant API (https://api.qwant.com/v3). The API is
undocumented but can be reverse engineered by reading the network log of
https://www.qwant.com/ queries.
This implementation is used by different qwant engines in the settings.yml::
- name: qwant
categories: general
...
- name: qwant news
categories: news
...
- name: qwant images
categories: images
...
- name: qwant videos
categories: videos
...
Signed-off-by: Markus Heiser <markus.heiser@darmarit.de>