Move wiki entry https://github.com/asciimoo/searx/wiki/Searx-instances
into user section of the docs (#1785).
links has been ported from markdown to reST by::
regexpr: \[([^\]]*)\]\(([^)]*)\)
substitution: `\1 <\2>`__
Signed-off-by: Markus Heiser <markus.heiser@darmarit.de>