remove alpha for workflow stable release (dapr#760)

Signed-off-by: Hannah Hunter <hannahhunter@microsoft.com>
Signed-off-by: Elena Kolevska <elena@kolevska.com>

Author: hhunter-ms

daprdocs/content/en/python-sdk-docs/python-sdk-extensions/python-workflow-ext/python-workflow.md

@@ -6,10 +6,6 @@ weight: 30000
 description: How to get up and running with workflows using the Dapr Python SDK
 ---
 
-{{% alert title="Note" color="primary" %}}
-Dapr Workflow is currently in alpha.
-{{% /alert %}}
-
 Let’s create a Dapr workflow and invoke it using the console. With the [provided hello world workflow example](https://github.com/dapr/python-sdk/tree/master/examples/demo_workflow), you will:
 
 - Run a [Python console application using `DaprClient`](https://github.com/dapr/python-sdk/blob/master/examples/demo_workflow/app.py)