add feed in / out button page and also button to redirect to button page

docker/nginx.conf

@@ -13,6 +13,14 @@ server {
     add_header X-Content-Type-Options "nosniff" always;
     add_header X-XSS-Protection "1; mode=block" always;
 
+    location = /button {
+        return 301 /button/;
+    }
+
+    location /button/ {
+        try_files $uri $uri/ /button/index.html;
+    }
+
     location / {
         try_files $uri $uri/ /index.html;
     }