Add sidecar health image and fix broken links

Signed-off-by: Nick Greenfield <nigreenf@microsoft.com>

daprdocs/content/en/concepts/resiliency-concept.md

@@ -29,6 +29,8 @@ Dapr provides a capability for monitoring app health through probes that check t
 Read more on how to apply [app health checks]({{< ref app-health >}}) to your application.
 
 ## Sidecar Health Checks
+<img src="/images/sidecar-health.png" width="800" alt="Diagram showing the app health feature. Running Dapr with app health enabled causes Dapr to periodically probe the app for its health">
+
 Dapr provides a way to determine its health using an [HTTP `/healthz` endpoint]({{< ref health_api.md >}}). With this endpoint, the *daprd* process, or sidecar, can be:
 
 - Probed for its health

daprdocs/content/en/developing-applications/integrations/Azure/authenticating-azure.md

@@ -84,7 +84,7 @@ To start, create a new Azure AD application, which will also be used as Service
 
 Prerequisites:
 
-- [Azure Subscription](https://azure.microsoft.com/free/)
+- Azure Subscription
 - [Azure CLI](https://docs.microsoft.com/cli/azure/install-azure-cli)
 - [jq](https://stedolan.github.io/jq/download/)
 - OpenSSL (included by default on all Linux and macOS systems, as well as on WSL)

daprdocs/content/en/developing-applications/integrations/Azure/azure-kubernetes-service-extension.md

@@ -7,7 +7,7 @@ weight: 4000
 ---
 
 # Prerequisites
-- [Azure subscription](https://azure.microsoft.com/free/?WT.mc_id=A261C142F)
+- Azure subscription
 - [Azure CLI](https://docs.microsoft.com/cli/azure/install-azure-cli-windows?tabs=azure-cli) and the ***aks-preview*** extension.
 - [Azure Kubernetes Service (AKS) cluster](https://docs.microsoft.com/azure/aks/tutorial-kubernetes-deploy-cluster?tabs=azure-cli)
 

daprdocs/content/en/getting-started/tutorials/configure-state-pubsub.md

@@ -64,9 +64,7 @@ For Kubernetes:
 {{% /codetab %}}
 
 {{% codetab %}}
-<!-- IGNORE_LINKS -->
-Verify you have an [Azure subscription](https://azure.microsoft.com/free/).
-<!-- END_IGNORE -->
+Verify you have an Azure subscription.
 
 1. Open and log into the [Azure portal](https://ms.portal.azure.com/#create/Microsoft.Cache) to start the Azure Redis Cache creation flow. 
 1. Fill out the necessary information.

daprdocs/content/en/reference/components-reference/supported-secret-stores/azure-keyvault.md

@@ -53,7 +53,7 @@ Additionally, you must provide the authentication fields as explained in the [Au
 
 ### Prerequisites
 
-- [Azure Subscription](https://azure.microsoft.com/free/)
+- Azure Subscription
 - [Azure CLI](https://docs.microsoft.com/cli/azure/install-azure-cli)
 - [jq](https://stedolan.github.io/jq/download/)
 - The scripts below are optimized for a bash or zsh shell