Workflow file is not in sync with GFguide requirements, causing release failure #182
Description
The issue:
The latest update to the workflow file:
https://github.com/googlefonts/googlefonts-project-template/blame/ca4b21bee0745406b28c1a647d02802634e03a1a/.github/workflows/build.yaml#L91
has hardcoded-in locations for ARTICLE.en_us.html and DESCRIPTION.en_us.html. It looks for ARTICLE to be in the documentation/ directory, but the guide tells designers that it should be in article/ (see https://googlefonts.github.io/gf-guide/article.html#the-article ).
Therefore the "Create and populate release" job fails if the designer follows the guide.
The job also fails if DESCRIPTION is not in documentation/, even though the guide says that DESCRIPTION is deprecated, and even though older versions of the template repo had DESCRIPTION in the project root. The guide also doesn't say where, specifically, the DESCRIPTION file needs to be, although it says "This file follows the same requirements as the Article file" which implies article/.
Solution: either the workflow or the guide needs changing so that they match.
Secondarily, if DOCUMENTATION is considered legacy now, then its absence shouldn't cause the job to fail.