Merged PR 379: #2560 - Network_simulator_demo.ipynb cell fixes

## Summary
Some minor changes to the network_simulator_demo jupyter notebook so that all cells run.
I've updated the notebook to use a **very lightly** modified version of the ARCD UC2 network that it has been using.
_I've added a single route into the router_1 route table so that `network.get_node_by_hostname("router_1").route_table.show()` returns something visible. I didn't want to have this within the 'normal' uc2 network. Don't @ me._

![image.png](https://dev.azure.com/ma-dev-uk/b50a61ee-86c4-48bc-9a0b-a67645ba12ee/_apis/git/repositories/2825053e-bd3b-45b2-8680-1281809eefa2/pullRequests/379/attachments/image.png)

Corrected a path typo in `basic_lan_network_example()` so it correctly loads that network config.

## Test process
I've not broken any existing tests, and the notebook now runs with fully populated cells.

## Checklist
- [X] PR is linked to a **work item**
- [X] **acceptance criteria** of linked ticket are met
- [X] performed **self-review** of the code
- [X] written **tests** for any new functionality added with this PR
- [X] updated the **documentation** if this PR changes or adds functionality
- [X] written/updated **design docs** if this PR implements new functionality
- [X] updated the **change log**
- [X] ran **pre-commit** checks for code style
- [X] attended to any **TO-DOs** left in the code

Related work items: #2560

src/primaite/simulator/network/networks.py

@@ -4,6 +4,7 @@ import yaml
 
 from primaite import getLogger, PRIMAITE_PATHS
 from primaite.game.game import PrimaiteGame
+from primaite.simulator import LogLevel, SIM_OUTPUT
 from primaite.simulator.network.container import Network
 from primaite.simulator.network.hardware.nodes.host.computer import Computer
 from primaite.simulator.network.hardware.nodes.host.host_node import NIC
@@ -287,6 +288,20 @@ def arcd_uc2_network() -> Network:
     return network
 
 
+def network_simulator_demo_example() -> Network:
+    """Returns a lightly modified version of the ARCD UC2 Network."""
+    # Ensure that sys_log will be viewable for demo
+    SIM_OUTPUT.sys_log_level = LogLevel.DEBUG
+    SIM_OUTPUT.save_sys_logs = True
+
+    network = arcd_uc2_network()
+    network.get_node_by_hostname("router_1").route_table.add_route(
+        address="192.168.10.0", subnet_mask="255.255.255.0", next_hop_ip_address="192.168.1.2"
+    )
+
+    return network
+
+
 def _get_example_network(path: str) -> Network:
     try:
         with open(path, "r") as file:
@@ -308,7 +323,7 @@ def client_server_p2p_network_example() -> Network:
 
 def basic_lan_network_example() -> Network:
     """Get the basic LAN example network."""
-    path = PRIMAITE_PATHS.user_config_path / "example_config" / "basic_network_network_example.yaml"
+    path = PRIMAITE_PATHS.user_config_path / "example_config" / "basic_lan_network_example.yaml"
     return _get_example_network(path)