add $uri/index.html to the list of files to try

nginx.conf

@@ -5,7 +5,7 @@ server {
     location /wiki/ {
         alias /etc/nginx/html/;
         index index.html index.htm;
-        try_files $uri $uri/ /index.html;
+        try_files $uri $uri/ $uri/index.html /index.html;
 
     }
     error_page 500 502 503 504 /50x.html;