DevOps / Serverless / GCP (Cloud) Functions (#5496)

Added some intro text and materials to get started.

src/data/roadmaps/devops/content/109-serverless/103-gcp-functions.md

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-# Gcp functions
+# GCP Cloud Functions
+
+Cloud Functions are the serverless "Function-as-a-Service" offer of Google Cloud Platform.
+
+- [GCP Cloud Functions Overview](https://cloud.google.com/functions/docs/concepts/overview)
+- [GCP Cloud Functions Tutorial](https://antonputra.com/google/google-cloud-functions-tutorial/)