Move pages under tldr, lint run.sh, update docs

tldr/gcloud-auth

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# gcloud auth
+
+> Grant and revoke authorization to `gcloud` and manage credentials.
+> See also: `gcloud`.
+> More information: <https://cloud.google.com/sdk/gcloud/reference/auth>.
+
+- Authorize Google Cloud access for the `gcloud` CLI with Google Cloud user credentials and set the current account as active:
+
+`gcloud auth login`
+
+- Authorize Google Cloud access similar to `gcloud auth login` but with service account credentials:
+
+`gcloud auth activate-service-account`
+
+- Manage Application Default Credentials (ADC) for Cloud Client Libraries:
+
+`gcloud auth application-default`
+
+- Display a list of Google Cloud accounts currently authenticated on your system:
+
+`gcloud auth list`
+
+- Display the current account's access token:
+
+`gcloud auth print-access-token`
+
+- Remove access credentials for an account:
+
+`gcloud auth revoke`