I would like to use the postmark theme with compodoc (https://compodoc.github.io/website/guides/themes.html).
However, it does not work! I have already tried
npm run doc:buildandserve --theme Postmark
npm run compodoc --theme postmark
I get the error Provided source folder postmark was not found in the current directory
Do I have to download the theme? Where do I find it?