chore(docs): redirect properly from /docs/docs

docs/nginx.conf

@@ -18,4 +18,8 @@ server {
     location /docs/contact {
         return 301 $scheme://vikunja.io/en/contact;
     }
+    
+    location /docs/docs {
+        return 301 $scheme://vikunja.io/docs;
+    }
 }