fix: shorten update notes and contain entry content in cards

src/lib/release-notes/markdown.ts

@@ -39,10 +39,26 @@ renderer.image = ({ href, title, text }) => {
 };
 
 export function renderReleaseMarkdown(markdown: string): string {
-  return marked.parse(markdown, {
+  const options = {
     async: false,
     breaks: true,
     gfm: true,
     renderer
-  }) as string;
+  } as const;
+  const tokens = marked.lexer(markdown, options);
+  let html = '';
+  let entryOpen = false;
+  for (const token of tokens) {
+    const boundary = token.type === 'hr' || (token.type === 'heading' && token.depth <= 3);
+    if (boundary && entryOpen) {
+      html += '</section>\n';
+      entryOpen = false;
+    }
+    if (token.type === 'heading' && token.depth === 3) {
+      html += '<section class="update-entry">\n';
+      entryOpen = true;
+    }
+    html += marked.parser([token], options);
+  }
+  return html + (entryOpen ? '</section>\n' : '');
 }