docs: update default network_params.json file (#197)

- reduce capella fork epoch to 0 from 2
- indent mev_params for easier readability
- add "mev_flood_seconds_per_bundle": 15,
- add "launch_custom_flood": false

---------
Co-authored-by: Gyanendra Mishra <anomaly.the@gmail.com>

network_params.json

 {
-    "participants": [
-        {
-            "el_client_type": "geth",
-            "el_client_image": "ethereum/client-go:latest",
-            "el_client_log_level": "",
-            "el_extra_params": [],
-            "cl_client_type": "lighthouse",
-            "cl_client_image": "sigp/lighthouse:latest",
-            "cl_client_log_level": "",
-            "beacon_extra_params": [],
-            "validator_extra_params": [],
-            "builder_network_params": null,
-            "count": 1
-        }
-    ],
-    "network_params": {
-        "network_id": "3151908",
-        "deposit_contract_address": "0x4242424242424242424242424242424242424242",
-        "seconds_per_slot": 12,
-        "slots_per_epoch": 32,
-        "num_validator_keys_per_node": 64,
-        "preregistered_validator_keys_mnemonic": "giant issue aisle success illegal bike spike question tent bar rely arctic volcano long crawl hungry vocal artwork sniff fantasy very lucky have athlete",
-        "capella_fork_epoch": 2,
-        "deneb_fork_epoch": 4
-    },
-    "launch_additional_services": true,
-    "wait_for_finalization": false,
-    "wait_for_verifications": false,
-    "verifications_epoch_limit": 5,
-    "global_client_log_level": "info",
-    "snooper_enabled": false,
-    "parallel_keystore_generation": false,
-    "mev_type": "None",
-    "mev_params": {
+	"participants": [
+		{
+			"el_client_type": "geth",
+			"el_client_image": "ethereum/client-go:latest",
+			"el_client_log_level": "",
+			"el_extra_params": [],
+			"cl_client_type": "lighthouse",
+			"cl_client_image": "sigp/lighthouse:latest",
+			"cl_client_log_level": "",
+			"beacon_extra_params": [],
+			"validator_extra_params": [],
+			"builder_network_params": null,
+			"count": 1
+		}
+	],
+	"network_params": {
+		"network_id": "3151908",
+		"deposit_contract_address": "0x4242424242424242424242424242424242424242",
+		"seconds_per_slot": 12,
+		"slots_per_epoch": 32,
+		"num_validator_keys_per_node": 64,
+		"preregistered_validator_keys_mnemonic": "giant issue aisle success illegal bike spike question tent bar rely arctic volcano long crawl hungry vocal artwork sniff fantasy very lucky have athlete",
+		"capella_fork_epoch": 0,
+		"deneb_fork_epoch": 500
+	},
+	"launch_additional_services": true,
+	"wait_for_finalization": false,
+	"wait_for_verifications": false,
+	"verifications_epoch_limit": 5,
+	"global_client_log_level": "info",
+	"snooper_enabled": false,
+	"parallel_keystore_generation": false,
+	"mev_type": null,
+	"mev_params": {
 		"mev_relay_image": "flashbots/mev-boost-relay",
 		"mev_relay_api_extra_args": [],
 		"mev_relay_housekeeper_extra_args": [],
 		"mev_relay_website_extra_args": [],
 		"mev_builder_extra_args": [],
 		"mev_flood_image": "flashbots/mev-flood",
-		"mev_flood_extra_args": []
-    }
-}
\ No newline at end of file
+		"mev_flood_extra_args": [],
+		"mev_flood_seconds_per_bundle": 15,
+		"launch_custom_flood": false
+	}
+}