Update README.md - badges and description (#80)

* Update README.md - badges and description

* Show nginx images instead of tempo - tempo is in worker

README.md

@@ -1,22 +1,24 @@
 # Tempo Operator
 
-[![CharmHub Badge](https://charmhub.io/tempo-k8s/badge.svg)](https://charmhub.io/tempo-k8s)
-[![Release](https://github.com/canonical/tempo-k8s-operator/actions/workflows/release.yaml/badge.svg)](https://github.com/canonical/tempo-k8s-operator/actions/workflows/release.yaml)
+[![CharmHub Badge](https://charmhub.io/tempo-coordinator-k8s/badge.svg)](https://charmhub.io/tempo-coordinator-k8s)
+[![Release](https://github.com/canonical/tempo-coordinator-k8s-operator/actions/workflows/release.yaml/badge.svg)](https://github.com/canonical/tempo-k8s-operator/actions/workflows/release.yaml)
 [![Discourse Status](https://img.shields.io/discourse/status?server=https%3A%2F%2Fdiscourse.charmhub.io&style=flat&label=CharmHub%20Discourse)](https://discourse.charmhub.io)
 
-This repository contains the source code for a Charmed Operator that drives [Tempo] on Kubernetes.
+This repository contains the source code for a Charmed Operator that drives [Tempo] on Kubernetes. It is destined to work together with [tempo-worker-k8s](https://charmhub.io/tempo-worker-k8s) to deploy and operate Tempo, a distributed tracing backend backed by Grafana. See [Tempo HA documentation](https://discourse.charmhub.io/t/charmed-tempo-ha/15531) for more details.
 
 ## Usage
 
 Assuming you have access to a bootstrapped Juju controller on Kubernetes, you can:
 
 ```bash
-$ juju deploy tempo-k8s # --trust (use when cluster has RBAC enabled)
+$ juju deploy tempo-coordinator-k8s # --trust (use when cluster has RBAC enabled)
 ```
 
+See [Deploy Tempo on top of COS-Lite](https://discourse.charmhub.io/t/tutorial-deploy-tempo-ha-on-top-of-cos-lite/15489) for the full tutorial.
+
 ## OCI Images
 
-This charm, by default, deploys `grafana/tempo:2.4.0`.
+This charm, by default, deploys `ubuntu/nginx:1.24-24.04_beta` and `nginx/nginx-prometheus-exporter:1.1.0`.
 
 ## Contributing
 
@@ -25,4 +27,4 @@ on enhancements to this charm following best practice guidelines, and the
 [contributing] doc for developer guidance.
 
 [Tempo]: https://grafana.com/traces/
-[contributing]: https://github.com/PietroPasotti/tempo-k8s-operator/blob/main/CONTRIBUTING.md
+[contributing]: https://github.com/canonical/tempo-coordinator-k8s-operator/blob/main/CONTRIBUTING.md