brotli圧縮の無効化など Resolve #6325 (#6326)

* disable brotli

* disable compress between nginx and app

docs/examples/misskey.nginx

@@ -53,6 +53,7 @@ server {
         proxy_set_header X-Real-IP $remote_addr;
         proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
         proxy_set_header X-Forwarded-Proto https;
+        proxy_set_header Accept-Encoding "";
         proxy_http_version 1.1;
         proxy_redirect off;