[mod] paper.html: add links to doi resolver

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

searx/webapp.py

@@ -466,6 +466,7 @@ def render(template_name: str, **kwargs):
     kwargs['proxify_results'] = settings['result_proxy']['proxify_results']
     kwargs['cache_url'] = settings['ui']['cache_url']
     kwargs['get_result_template'] = get_result_template
+    kwargs['doi_resolver'] = get_doi_resolver(request.preferences)
     kwargs['opensearch_url'] = (
         url_for('opensearch')
         + '?'