Readme update (#159)

* url repo to oci

* link fixed

README.md

@@ -11,36 +11,29 @@ Follow the README.md of each chart to evaluate the technologies in your kubernet
 
 ## Install chart from helm repository
 
-charts in `charts/`` folder are packaged and available at Gradiant's openverso helm repo:  
+charts in `charts/`` folder are packaged and available at Gradiant's DockerHub repo:  
 
-[https://gradiant.github.io/openverso-charts/](https://gradiant.github.io/openverso-charts/)
+[https://hub.docker.com/u/gradiant](https://hub.docker.com/u/gradiant)
 
-You can add the helm repo to your Helm CLI:
+You can pull and save locally the chart. For example:
 
 ```bash
-helm repo add openverso https://gradiant.github.io/openverso-charts/
+helm pull oci://registry-1.docker.io/gradiant/open5gs --version 2.2.0
 ```
 
-Then you have a collection of charts available to install. For example, to install open5gs:
+You can directly install the chart. For example, to install open5gs:
 
 ```bash
-helm install gradiant/open5gs
+helm install open5gs oci://registry-1.docker.io/gradiant/open5gs --version 2.2.0
 ```
 
-## Install chart from release
-
-install using the URL of the release. For example, to install open5gs v0.1.0 chart:
-
-```bash
-helm install https://github.com/Gradiant/openverso-charts/releases/download/open5gs-0.1.0/open5gs-0.1.0.tgz
-```
 
 ## Check out our tutorials
 
 We have developed some tutorials meant to **guide you through the combined deployment of different technologies**. It is an easy and quick way of testing these technologies and exploring how they work.
 
 These tutorials make use of charts available at this helm repo, and their corresponding documentation can be found at:
-[https://gradiant.github.io/openverso-charts/](https://gradiant.github.io/openverso-charts/)
+[https://gradiant.github.io/5g-charts/](https://gradiant.github.io/5g-charts/)
 
 ## Development