Some metadata issues

While doing some unrelated work, I noticed a few things that need attention in this repository.

It appears that the template has been modified. Don't do this. Please revert the license text to that of the standard Apache-2.0 license.

The the pom.xml file in the dco-gateway should describe the content as an Eclipse project:

• The groupId should be org.eclipse.dco (or some subgroup of that).
• The organization should be either "Eclipse Foundation" or "The Eclipse Developer Console Project" and the corresponding url should either point to the project's vendor-neutral website, this GitLab project, or to the project's PMI page.
• Either list developers by name or omit the developers section. The convention is that you might list the names of committer. You can indicate the employer of each individual, but the company itself is not the developer.
• I believe that an scm entry is required for promotion to Maven Central.
• I believe that a license entry is required for promotion to Maven Central (use the SPDX code: Apache-2.0).

This list is not comprehensive. These are just the things that I noticed.