helmholtz-cloud-header: modify the cloud logo

Motivation:

https://gitlab.hzdr.de/hifis-technical-platform/helmholtz-marketplace-webapp/-/issues/23

Modifcation:

- modify the cloud logo to be on a single line
- change the size to 250px

src/common-components/header/helmholtz-cloud-header.js

@@ -42,6 +42,7 @@ class HelmholtzCloudHeader extends LitElement
             }
             .logo img {
                 height: 24px;
+                width: 250px;
                 cursor: pointer;
             }
             .top-nav {