doc(website): add preload_security_parameter to aggregator doc

Author: Alenar

docs/website/root/manual/develop/nodes/mithril-aggregator.md

@@ -537,6 +537,7 @@ Here is a list of the available parameters for the serve command:
 | `cardano_transactions_prover_max_hashes_allowed_by_request`      | `--cardano-transactions-prover-max-hashes-allowed-by-request`      |          -           | `CARDANO_TRANSACTIONS_PROVER_MAX_HASHES_ALLOWED_BY_REQUEST`                                               | Maximum number of transactions hashes allowed by request to the prover of the Cardano transactions                                                                                                       | `100`                                         | `100`                                                                                                                                                                                                                                                                                            |                        -                        |
 | `cardano_transactions_block_streamer_max_roll_forwards_per_poll` | `--cardano-transactions-block-streamer-max-roll-forwards-per-poll` |          -           | `CARDANO_TRANSACTIONS_BLOCK_STREAMER_MAX_ROLL_FORWARDS_PER_POLL`                                          | Maximum number of roll forwards during a poll of the block streamer when importing transactions                                                                                                          | `1000`                                        | `1000`                                                                                                                                                                                                                                                                                           |                        -                        |
 | `cardano_transactions_signing_config`                            | `--cardano-transactions-signing-config`                            |          -           | `CARDANO_TRANSACTIONS_SIGNING_CONFIG`                                                                     | Cardano transactions signing configuration                                                                                                                                                               | `{ "security_parameter": 3000, "step": 120 }` | `{ "security_parameter": 3000, "step": 120 }`                                                                                                                                                                                                                                                    |                        -                        |
+| `preload_security_parameter`                                     | -                                                                  |          -           | `PRELOAD_SECURITY_PARAMETER`                                                                              | Blocks offset, from the tip of the chain, to exclude during the cardano transactions preload<br/>`[default: 2160]`.                                                                                      | `2160`                                        | -                                                                                                                                                                                                                                                                                                |               :heavy_check_mark:                |
 | `enable_metrics_server`                                          | `--enable-metrics-server`                                          |          -           | `ENABLE_METRICS_SERVER`                                                                                   | Enable metrics HTTP server (Prometheus endpoint on /metrics)                                                                                                                                             | `false`                                       | -                                                                                                                                                                                                                                                                                                |                        -                        |
 | `metrics_server_ip`                                              | `--metrics-server-ip`                                              |          -           | `METRICS_SERVER_IP`                                                                                       | Metrics HTTP server IP                                                                                                                                                                                   | `0.0.0.0`                                     | -                                                                                                                                                                                                                                                                                                |                        -                        |
 | `metrics_server_port`                                            | `--metrics-server-port`                                            |          -           | `METRICS_SERVER_PORT`                                                                                     | Metrics HTTP server listening port                                                                                                                                                                       | `9090`                                        | -                                                                                                                                                                                                                                                                                                |                        -                        |