integration-docs: Update Wekan for new doc format.

Part of zulip#29592.

zerver/webhooks/wekan/doc.md

@@ -1,18 +1,29 @@
+# Zulip Wekan integration
+
 Get Wekan notifications in Zulip!
 
+{start_tabs}
+
 1. {!create-channel.md!}
 
 1. {!create-an-incoming-webhook.md!}
 
-1. {!generate-integration-url.md!}
+1. {!generate-webhook-url-basic.md!}
 
-    {!git-webhook-url-with-branches.md!}
+1. Go to Wekan, click the **Settings** icon, and select **Outgoing Webhooks**.
 
-1. Go to Wekan and click on the **Settings** icon.
-   Select **Outgoing Webhooks**.
+1. Set **URL** to the URL generated above, and click **Add Webhook**.
 
-1. Set **URL** to the URL constructed above and click **Add Webhook**.
+{end_tabs}
 
 {!congrats.md!}
 
 ![](/static/images/integrations/wekan/001.png)
+
+### Configuration options
+
+{!git-branches-additional-feature.md!}
+
+### Related documentation
+
+{!webhooks-url-specification.md!}