Terraform best practices (#3131)

* Add integration with Terraform in IaC section

* Add best practices for managing ZenML stacks with Terraform

* Update ZenML Terraform stack management guide

* Update heading to "Manage your stacks with Terraform".

* Update description in Terraform guide for ZenML integration

* Delete Zone.Identifier from book_giveaway.png asset

* Update infrastructure deployment file paths and references

* Update ZenML GCP infrastructure deployment with Terraform

* Add ZenML provider to Terraform stack components

* Add ZenML provider configuration and service connectors

* Refactor infrastructure-as-code best practices

* Update icon in infrastructure-as-code README

* Add ZenML provider link to Terraform stack management guide

* Optimised images with calibre/image-actions

* Update docs/book/how-to/infrastructure-deployment/infrastructure-as-code/terraform-stack-management.md

Co-authored-by: Alex Strick van Linschoten <strickvl@users.noreply.github.com>

* Introduce stack components as abstractions over resources

* Update docs/book/how-to/infrastructure-deployment/infrastructure-as-code/terraform-stack-management.md

Co-authored-by: Alex Strick van Linschoten <strickvl@users.noreply.github.com>

* Update code snippets to align to latest terraform provider

---------

Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>
Co-authored-by: Alex Strick van Linschoten <strickvl@users.noreply.github.com>
Co-authored-by: Stefan Nica <stefan@zenml.io>

docs/book/how-to/infrastructure-deployment/infrastructure-as-code/README.md

@@ -0,0 +1,16 @@
+---
+icon: network-wired
+description: >
+  Leverage Infrastructure as Code to manage your ZenML stacks and components.
+---
+
+# Integrate with Infrastructure as Code
+
+[Infrastructure as Code (IaC)](https://aws.amazon.com/what-is/iac) is 
+the practice of managing and provisioning infrastructure through code 
+instead of through manual processes.
+
+In this section, we will show you how to integrate ZenML with popular
+IaC tools such as [Terraform](https://www.terraform.io/).
+
+![Screenshot of ZenML stack on Terraform Registry](../../.gitbook/assets/terraform_providers_screenshot.png)