fix copy md (#12790)

gatsby/onCreateNode.ts

@@ -252,10 +252,15 @@ export const onCreateNode: GatsbyNode['onCreateNode'] = async ({
 
         const contentWithoutFrontmatter = stripFrontmatter(node.rawBody)
         const contentWithSnippets = resolveSnippets(contentWithoutFrontmatter, node.fileAbsolutePath)
+
+        // Prepend title as H1 if it exists
+        const title = node.frontmatter?.title
+        const contentWithSnippetsAndTitle = title ? `# ${title}\n\n${contentWithSnippets}` : contentWithSnippets
+
         createNodeField({
             node,
             name: `contentWithSnippets`,
-            value: contentWithSnippets,
+            value: contentWithSnippetsAndTitle,
         })
     }
 

src/templates/Handbook.tsx

@@ -340,7 +340,7 @@ export default function Handbook({
             hideRightSidebar,
             contentMaxWidthClass,
         },
-        fields: { slug, contributors, appConfig, templateConfigs, commits },
+        fields: { slug, contributors, appConfig, templateConfigs, commits, contentWithSnippets },
         excerpt,
     } = post
 
@@ -401,6 +401,7 @@ export default function Handbook({
                 showSurvey
                 hideRightSidebar={hideRightSidebar}
                 contentMaxWidthClass={contentMaxWidthClass}
+                markdownContent={contentWithSnippets}
             />
         </>
     )
@@ -435,6 +436,7 @@ export const query = graphql`
             excerpt(pruneLength: 150)
             fields {
                 slug
+                contentWithSnippets
                 commits {
                     author {
                         avatar_url