Disable editor network bootstrap in builds; tune scenes and paint HUD panel

NetworkBootstrap now destroys itself outside the editor. Camera FOV/background
tweaks in Main, lobby light intensity, and paint HUD panel font/color polish.

Assets/Scripts/NetworkBootstrap.cs

@@ -24,7 +24,16 @@ public class NetworkBootstrap : MonoBehaviour
 
     private NetworkManager _net;
 
-    private void Awake() => _net = GetComponent<NetworkManager>();
+    private void Awake()
+    {
+        if (!Application.isEditor)
+        {
+            Destroy(this);
+            return;
+        }
+
+        _net = GetComponent<NetworkManager>();
+    }
 
     private void Update()
     {