use letsencrypt for ssl

src/freedombone-utils-web

     echo '    ssl_stapling off;' >> $filename
     echo '    ssl_stapling_verify off;' >> $filename
     echo '    ssl on;' >> $filename
-    if [ -f /etc/ssl/certs/${domain_name}.pem ]; then
-        echo "    ssl_certificate /etc/ssl/certs/${domain_name}.pem;" >> $filename
-    else
-        echo "    ssl_certificate /etc/ssl/certs/${domain_name}.crt;" >> $filename
-    fi
-    echo "    ssl_certificate_key /etc/ssl/private/${domain_name}.key;" >> $filename
+    echo "    ssl_certificate /etc/letsencrypt/live/${domain_name}/fullchain.pem;" >> $filename
+    echo "    ssl_certificate_key /etc/letsencrypt/live/${domain_name}/privkey.pem;" >> $filename
     echo "    ssl_dhparam /etc/ssl/certs/${domain_name}.dhparam;" >> $filename
     echo '' >> $filename
     echo '    ssl_session_cache  builtin:1000  shared:SSL:10m;' >> $filename