Update cheatsheets

gcloud-app

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# gcloud app
+
+> Build scalable applications on a managed serverless platform.
+> See also: `gcloud`.
+> More information: <https://cloud.google.com/sdk/gcloud/reference/app>.
+
+- Deploy an app's code and configuration to the App Engine server:
+
+`gcloud app deploy {{deployables}}`
+
+- List all versions of all services deployed to the App Engine server:
+
+`gcloud app versions list`
+
+- Open the current app in a web browser:
+
+`gcloud app browse`
+
+- Create an App Engine app within the current project:
+
+`gcloud app create`
+
+- Display the latest App Engine app logs:
+
+`gcloud app logs read`