feat: Specify a character set on server

nginx-default.conf

@@ -19,6 +19,10 @@ server {
         index  index.html index.htm;
     }
 
+    # https://gtmetrix.com/specify-a-character-set-early.html
+    # https://www.cyberciti.biz/faq/nginx-set-http-content-type-response-header-to-charset-utf8/
+    charset UTF-8;
+
     #Caching (save html pages for 7 days, rest as long as possible, no caching on frontpage)
     expires $expires;