chore: Add Artifact Hub & FOSSA badges
<a href="https://github.com/kedacore/keda/actions?query=workflow%3Amain-build"><img src="https://github.com/kedacore/keda/workflows/main-build/badge.svg" alt="main build"></a>
<a href="https://github.com/kedacore/keda/actions?query=workflow%3Anightly-e2e-test"><img src="https://github.com/kedacore/keda/workflows/nightly-e2e-test/badge.svg" alt="nightly e2e"></a>
<a href="https://bestpractices.coreinfrastructure.org/projects/3791"><img src="https://bestpractices.coreinfrastructure.org/projects/3791/badge"></a>
+<a href="https://artifacthub.io/packages/helm/kedacore/keda"><img src="https://img.shields.io/endpoint?url=https://artifacthub.io/badge/repository/kedacore"></a>
+<a href="https://app.fossa.io/projects/git%2Bhttps%3A%2F%2Fgithub.com%2Fkedacore%2Fkeda?ref=badge_shield"><img src="https://app.fossa.io/api/projects/git%2Bhttps%3A%2F%2Fgithub.com%2Fkedacore%2Fkeda.svg?type=shield"></a>
<a href="https://twitter.com/kedaorg"><img src="https://img.shields.io/twitter/follow/kedaorg?style=social" alt="Twitter"></a></p>
KEDA allows for fine-grained autoscaling (including to/from zero) for event driven Kubernetes workloads. KEDA serves
