Remove documentation site and GitHub Action, update README references

CONTRIBUTING.md

@@ -46,7 +46,7 @@ Follow our [Installation Instructions](https://docs.nginx.com/nginx-gateway-fabr
 - We use [Go Modules](https://github.com/golang/go/wiki/Modules) for managing dependencies.
 - We use [Ginkgo](https://onsi.github.io/ginkgo/) and [Gomega](https://onsi.github.io/gomega/) for our BDD style unit
   tests.
-- The documentation website is found under `site/`.
+- The documentation is managed in [the NGINX documentation repository](https://github.com/nginx/documentation).
 
 ## Contributing
 
@@ -97,7 +97,7 @@ Before beginning development, familiarize yourself with the following documents:
   conventions to follow when writing Go code for the project.
 - [Architecture](https://docs.nginx.com/nginx-gateway-fabric/overview/gateway-architecture/): A high-level overview of the project's architecture.
 - [Design Principles](/docs/developer/design-principles.md): An overview of the project's design principles.
-- [NGINX Gateway Fabric Documentation](/site/README.md): An explanation of the documentation tooling and conventions.
+- [The NGINX documentation repository](https://github.com/nginx/documentation): The repository for NGINX documentation, which is used for the website.
 
 ## F5 Contributor License Agreement (CLA)
 

README.md

@@ -22,7 +22,7 @@ Learn about our [design principles](/docs/developer/design-principles.md) and [a
 
 ## Getting Started
 
-1. [Quick Start on a kind cluster](https://docs.nginx.com/nginx-gateway-fabric/get-started/).
+1. [Get started using a kind cluster](https://docs.nginx.com/nginx-gateway-fabric/get-started/).
 2. [Install](https://docs.nginx.com/nginx-gateway-fabric/installation/) NGINX Gateway Fabric.
 3. Deploy various [examples](examples).
 4. Read our [How-to guides](https://docs.nginx.com/nginx-gateway-fabric/how-to/).