Update glance image create howto section (#290)

Author: lgrebe-sys

user/pages/03.Howtos/07.upload-images/docs.en.md

@@ -21,36 +21,14 @@ There are three different ways to upload custom images.
 ### OpenStack-CLI
 
 You need to have the [OpenStack-CLI](../../03.Howtos/02.openstack-cli/docs.en.md) installed and configured.
+Download an image you want to use, e.g. an [Ubuntu cloud image](https://cloud-images.ubuntu.com).
 After [sourcing the openrc.sh](../../02.Tutorials/02.api-access/docs.en.md) you can easily upload your own image and use it right after, like this:
 
 ```shell
-glance --os-image-api-version 1 image-create --progress --is-public False --disk-format=qcow2 \
---container-format=bare --property architecture=x86_64 --name="Debian Stretch" \
---location https://cdimage.debian.org/cdimage/openstack/current-9/debian-9-openstack-amd64.qcow2
+openstack image create --progress --private --disk-format=qcow2 --container-format=bare \
+--property architecture=x86_64 --name="Ubuntu Noble" --file noble-server-cloudimg-amd64.img
 ```
 
-### Heat-Template
-
-It is also possible to upload images with heat.
-An example can look like this:
-
-```yaml
-heat_template_version: 2016-04-08
-
-description: Simple template to upload an image
-
-resources:
-  glance_image:
-    type: OS::Glance::Image
-    properties:
-      container_format: bare
-      disk_format: qcow2
-      name: Debian Stretch
-      location: https://cdimage.debian.org/cdimage/openstack/current-9/debian-9-openstack-amd64.qcow2
-```
-
-Further information can be found [here](https://cloud.syseleven.de/horizon/project/resource_types/OS::Glance::Image/).
-
 ## Image sources
 
 !!! [This overview](../../04.Reference/06.images/docs.en.md#image-sources) contains a list of standard images sources.