rename files with conf type,

cleanup other config files

Signed-off-by: Arthur Lu <learthurgo@gmail.com>

snippets/ssl-params.conf

@@ -9,7 +9,6 @@ ssl_stapling on;
 ssl_stapling_verify on;
 resolver 8.8.8.8 8.8.4.4 valid=300s;
 resolver_timeout 5s;
-# add_header Strict-Transport-Security "max-age=31536000; includeSubdomains" always;
 add_header X-Frame-Options SAMEORIGIN;
 add_header X-Content-Type-Options nosniff;
 add_header X-XSS-Protection "1; mode=block";