Sculpin: added HTML & Markdown

The Sculpin website notes its ability to use plain HTML & Markdown (https://sculpin.io/)

Author: Denperidge

src/site/generators/sculpin.md

@@ -8,6 +8,8 @@ license:
   - MIT
 templates:
   - Twig
+  - HTML
+  - Markdown
 description: Sculpin is a static site generator written in PHP
 ---