PD-825 Move NetworkSummary.md Content

This commit moves the NetworkSummary.md article content to the /network/_index.md file and deletes the NetworkSummary.md file to convert the empty index file to one providing the basic network summary content.
It also deletes a duplicate NetworkSummary.md article not removed during the original content reorg into tutorials and UI ref content.

content/CORE/CORETutorials/Network/_index.md

@@ -1,9 +1,40 @@
 ---
 title: "Network"
-description: "Tutorials related to configuring CORE networking."
+description: "Provides information on using the Network Summary screen and lists other tutorials related to configuring CORE networking."
 geekdocCollapseSection: true
 weight: 80
 related: false
+aliases: 
+ - /core/network/networksummary/
+ - /core/coretutorials/network/networksummary/
+tags:
+- network
 ---
 
+## Network Summary
+
+The **Network Summary** screen gives a concise overview of the current network setup.
+It provides information about the currently active interfaces, default routes, and name servers configured on the system.
+These areas are not editable.
+
+![**Network Summary**](/images/CORE/Network/NetworkSummary.png "Network Summary")
+
+* [**Interfaces**]({{< relref "/CORE/CORETutorials/Network/Interfaces/_index.md" >}}) shows configured physical, [bridge]({{< relref "/CORE/CORETutorials/Network/Interfaces/BridgeCreate.md" >}}), link aggregation [LAGG]({{< relref "/CORE/CORETutorials/Network/Interfaces/LAGGCreate.md" >}}), and virtual LAN [vlan]({{< relref "/CORE/CORETutorials/Network/Interfaces/VLANCreate.md" >}}) interfaces.
+  All detected physical interfaces are listed, even when unconfigured.
+  The IPv4 or IPv6 address displays when a [static IP]({{< relref "/CORE/CORETutorials/Network/Interfaces/SettingStaticIP.md" >}}) is saved for an interface.
+
+* **Default Routes** lists all saved TrueNAS default routes.
+  Go to **Network > Global Configuration** to configure default routes.
+
+* **Nameservers** lists any configured DNS name servers that TrueNAS uses. 
+  To change this list, go to **Network > Global Configuration**. 
+  **Network > Global Configuration** contains the TrueNAS host name and domain, and default gateway. It also contains other options.
+
+Define a static route in **Network > [Static Routes]({{< relref "/CORE/CORETutorials/Network/StaticRoutes.md" >}})**.
+
+Out-of-band management is managed from **Network > [IPMI]({{< relref "/CORE/CORETutorials/Network/IPMI.md" >}})**. 
+This option is visible only when TrueNAS detects the appropriate physical hardware.
+
+## Network Articles
+
 {{< children depth="2" description="true" >}}