docs: move wiki/Searx-instances from wiki to docs

fix project link in conf.py

Signed-off-by: Markus Heiser <markus.heiser@darmarit.de>

docs/conf.py

@@ -94,7 +94,7 @@ html_context = {
     "project_links": [
         ProjectLink("Source", GIT_URL),
         ProjectLink("Wiki", "https://github.com/asciimoo/searx/wiki"),
-        ProjectLink("Public instances", "https://github.com/asciimoo/searx/wiki/Searx-instances"),
+        ProjectLink("Public instances", "https://asciimoo.github.io/searx/user/public_instances.html"),
         ProjectLink("Twitter", "https://twitter.com/Searx_engine"),
     ]
 }