Quick README cleanup, removing a lot of out of date information

README.md

@@ -2,27 +2,13 @@
 [![Go Reference](https://pkg.go.dev/badge/github.com/jetstack/jetstack-secure.svg)](https://pkg.go.dev/github.com/jetstack/jetstack-secure)
 [![Go Report Card](https://goreportcard.com/badge/github.com/jetstack/jetstack-secure)](https://goreportcard.com/report/github.com/jetstack/jetstack-secure)
 
-![Jetstack Secure](./docs/images/js.png)
-
-[Jetstack Secure](https://www.jetstack.io/jetstack-secure/) manages your machine identities across Cloud Native Kubernetes and OpenShift environments and builds a detailed view of the enterprise security posture.
-
-This repo contains the open source in-cluster agent of Jetstack Secure, that sends data to the [Jetstack Secure
-SaaS](https://platform.jetstack.io).
-
-> **Wondering about Preflight?** Preflight was the name for the project that was the foundation for the Jetstack Secure platform. It was a tool to perform configuration checks on a Kubernetes cluster using OPA's REGO policy. We decided to incorporate that functionality as part of the Jetstack Secure SaaS service, making this component a basic agent. You can find the old Preflight Check functionality in the git history ( tagged as `preflight-local-check` and you also check [this documentation](https://github.com/jetstack/jetstack-secure/blob/preflight-local-check/docs/check.md).
+"The agent" manages your machine identities across Cloud Native Kubernetes and OpenShift environments and builds a detailed view of the enterprise security posture.
 
 ## Installation
 
 Please [review the documentation](https://platform.jetstack.io/documentation/installation/agent)
 for the agent before getting started.
 
-The released container images are cryptographically signed by
-[`cosign`](https://github.com/sigstore/cosign), with
-[SLSA provenance](https://slsa.dev/provenance/v0.2) and a
-[CycloneDX SBOM](https://cyclonedx.org/) attached. For instructions on how to
-verify those signatures and attachments, refer to
-[this guide](docs/guides/cosign).
-
 ## Local Execution
 
 To build and run a version from master: