Update project: Windmill and Cinder themes are not unlicensed

**Update details:** I took a look at the Cinder and Windmill themes' repos and they both appear to have an MIT license, but are marked as unlicensed in this catalog. <!--- Please state the project name that this update is referring to and list all information or metadata that needs to be changed, added or removed. This might include the license, package managers, github url, description, and any other available property. --> - Project Name: Windmill and Cinder themes <!--- State all information that needs to be updated. --> - Needs update: licenses