Tell GitHub to Render Markdown Pages with .gitattributes

from blog Hearthside by Caleb Hearth, | ↗ original
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Articles on Hearthside are written in Markdown (GitHub-flavored), but the file extension is .md.yaml as they also make use of Jekyll-style front matter. My Frontmatter gem requires that files it handles end in .yaml or .yml, so this is necessary.