Add script 'jitsi-auth-dovecot.sh'. Add/Justify some documentation.

jitsi-post-install.sh

@@ -1214,6 +1214,15 @@ else
    echo_ok
 fi
 
+echononl "Restart Nginx webservice.."
+systemctl restart nginx > "$log_file" 2>&1
+if [[ $? -ne 0 ]]; then
+   echo_failed
+   error "$(cat "$log_file")"
+else
+   echo_ok
+fi
+
 if $_tem_prosody_config_created ; then
    warn "Please check file '/etc/prosody/conf.avail/${FQHN_HOSTNAME}.cfg.lua'"
 fi