Add serverless page

pages/common/serverless.md

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+# serverless
+
+> Toolkit for deploying and operating serverless architectures on AWS, Google Cloud, Azure and IBM OpenWhisk.
+
+- Create a serverless project.
+
+`sls create`
+
+- Create a serverless project from template:
+
+`sls create --template {{template_name}}`
+
+- Deploy to a cloud provider:
+
+`sls deploy`
+
+- Display information about a serverless project:
+
+`sls info`
+
+- Follow logs for a project:
+
+`sls logs -t`
+
+- Display metrics for a function:
+
+`sls metrics -f {{function_name}}`