Vincent Bernat 06a5fb2ada nginx: use a compression level of 5 in recommended configuration
While there is little gain of space to use a compression level of 9,
the CPU usage is significant. Many experiments point to use something
between 4 and 6. For example:

 - https://mjanja.ch/2015/03/finding-the-nginx-gzip_comp_level-sweet-spot/
 - 3bda5b93ed/nginx.conf (L93)
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