Drop Daimler namespace at open-vsx.org after renaming has been done

[company-jcup]

With

• Claiming namespace mercedes-benz EclipseFdn/open-vsx.org#741 (comment)
• Claiming namespace mercedesbenz EclipseFdn/open-vsx.org#742
  we have claimed the namespaces "mercedes-benz" and "mercedesbenz" at open-vsx

After the renaming of Daimler AG to Mercedes-Benz AG and the deployment to the new namespace (+ info community etc.) the open-vsx namespace can be removed.

To remove the extension from legacy namespace a separate issue is necessary:

If you need an extension removed from a legacy namespace, please file a separate issue.