Removed legacy charset directive from default config example.

The example configuration previously specified 'charset koi8-r',
which is a legacy Cyrillic encoding.  As koi8-r is rarely used today
and modern browsers handle UTF-8 by default, specifying the charset
explicitly is unnecessary.  Removing the directive keeps the example
configuration concise and aligned with current best practices.

conf/nginx.conf

@@ -36,8 +36,6 @@ http {
         listen       80;
         server_name  localhost;
 
-        #charset koi8-r;
-
         #access_log  logs/host.access.log  main;
 
         location / {