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

tldr/aws-sts

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# aws sts
+
+> Security Token Service (STS) allows to request temporary credentials for (IAM) users or federated users.
+> More information: <https://docs.aws.amazon.com/cli/latest/reference/sts/>.
+
+- Get temporary security credentials to access specific AWS resources:
+
+`aws sts assume-role --role-arn {{aws_role_arn}}`
+
+- Get an IAM user or role whose credentials are used to call the operation:
+
+`aws sts get-caller-identity`