If you use composer, the composer config shown in "extension installation" is insufficient. You have to provide the extension key at least. Otherwise your site package extension will be missing. => Added reference to "extension configuration" which has a perfect example.
If you use composer, the composer config shown in "extension installation" is insufficient. You have to provide the extension key at least. Otherwise your site package extension will be missing. => Added reference to "extension configuration" which has a perfect example.
Also fixed the template file's path.