simplify nginx config

Author: keeakita

nginx.conf

@@ -39,7 +39,7 @@ http {
         location / {
             root /app/static/;
             index index.html index.htm;
-            try_files $uri $uri/ /index.html @backend;
+            try_files $uri $uri/ /index.html;
         }
 
         location /api {
@@ -48,9 +48,6 @@ http {
         location /admin {
             proxy_pass http://127.0.0.1:8080;
         }
-        location @backend {
-            proxy_pass http://127.0.0.1:8080;
-        }
 
         #error_page  404              /404.html;