fix(nginx): redirect /docs/docs to /docs

nginx.conf

@@ -63,6 +63,10 @@ http {
             return 302 https://vikunja.cloud/features?from=io;
         }
 
+        location /docs/docs {
+            return 302 https://vikunja.io/docs;
+        }
+
         location /survey {
             return 302 https://forms.reform.app/oSTwrh/vikunja-feedback;
         }