Improve mesh gateway diagram

Diagram now shows all possible cross-DC communication models supported by mesh
gateways for both the control and data planes.

website/content/docs/connect/gateways/mesh-gateway/index.mdx

@@ -61,7 +61,8 @@ receive incoming traffic even if that traffic has passed through a gateway.
 ## Modes of Operation
 
 Each upstream of a Connect proxy can be configured to be routed through a mesh gateway. Depending on
-your network, the proxy's connection to the gateway can happen in one of the following modes:
+your network, the proxy's connection to the gateway can happen in one of the following modes
+illustrated in the diagram above:
 
 - `local` - In this mode the Connect proxy makes its outbound connection to a gateway running in the
   same datacenter. That gateway is then responsible for ensuring the data gets forwarded along to

website/content/docs/connect/gateways/mesh-gateway/wan-federation-via-mesh-gateways.mdx

@@ -38,6 +38,8 @@ Operators looking to simplify their WAN deployment and minimize the exposed
 security surface area can elect to join these datacenters together using [mesh
 gateways](/docs/connect/gateways/mesh-gateway) to do so.
 
+![Mesh Gateway Architecture](/img/mesh-gateways.png)
+
 ## Architecture
 
 There are two main kinds of communication that occur over the WAN link spanning