Create CAPG book from existing docs

docs/book/book.toml

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+[book]
+authors = ["The Cluster API Provider GCP Maintainers"]
+language = "en"
+multilingual = false
+src = "src"
+title = "Kubernetes Cluster API Provider GCP"
+
+[output.html]
+curly-quotes = true
+git-repository-url = "https://sigs.k8s.io/cluster-api-provider-gcp"
+no-section-label = true
+
+[output.html.redirect]
+"/agenda.html" = "/agenda/2024.html"
+"/agenda/2024.html" = "https://docs.google.com/document/d/1l8B947Je79ZJX7zmKnJyMcOMIWjNidvp5FMTnPAY72I/"
+
+[preprocessor.tabulate]
+command = "mdbook-tabulate"
+
+[preprocessor.embed]
+command = "mdbook-embed"
+
+[preprocessor.releaselink]
+command = "mdbook-releaselink"

docs/book/src/SUMMARY.md

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+# Summary
+
+[Introduction](./introduction.md)
+- [Getting Started](./getting-started.md)
+- [Topics](./topics/index.md)
+    - [Prerequisites](./topics/prerequisites.md)
+    - [Conformance](./topics/conformance.md)
+    - [GKE Support](./topics/gke/index.md)
+        - [Creating a Cluster](./topics/gke/creating-a-cluster.md)
+        - [Cluster Upgrades](./topics/gke/cluster-upgrades.md)
+        - [Enabling](./topics/gke/enabling.md)
+        - [Disabling](./topics/gke/disabling.md)
+    - [Machine Locations](./topics/machine-locations.md)
+    - [Preemptible VMs](./topics/preemptible-vms.md)
+    - [Flannel](./topics/flannel.md)
+- [Developer Guide](./developers/index.md)
+    - [Development](./developers/development.md)
+    - [Creating a cluster](./developers/cluster-creation.md)
+    - [CI Jobs](./developers/jobs.md)
+    - [Releasing](./developers/releasing.md)
+- [Roadmap](./roadmap.md)

docs/book/src/developers/index.md

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+Everything you need to know about contributing to CAPG.
+
+If you are new to the project and want to help but don't know where to start, you can refer to the [Cluster API contributing guide](https://github.com/kubernetes-sigs/cluster-api/blob/main/CONTRIBUTING.md).

docs/book/src/getting-started.md

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+{{#embed-github repo:"kubernetes-sigs/cluster-api" path:"docs/book/src/user/quick-start.md"}}

docs/book/src/introduction.md

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+{{#include ../../../README.md}}

docs/book/src/topics/index.md

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+This section contains information about the main CAPG features and how to use them.