While Wyam is certainly still usable, it's been rebranded and rebooted as Statiq with a ton of improvements. You almost certainly want to look there unless you're already a Wyam user.

Docs Recipe

Create different kinds of documentation sites with content, blogs, and generated API pages.

Overview An overview of the Docs recipe, including key features and usage notes.
Settings Settings that can be configured to control the generation process.
Document Metadata Metadata that can be set at the document level to control the generation process.
Pipelines The pipelines involved in the recipe and what they do.
Themes Details about the themes that support this recipe and how to customize them.