fix(andreknie.de): normalize SEO metadata and document structure

privat/CV/andreknie.de/plugins/vite-plugin-content.js

@@ -25,7 +25,7 @@ function readContentDir(subdir) {
         return {
           ...data,
           slug,
-          body: marked(content),
+          body: renderMarkdownContent(content),
           _source: `${subdir}/${filename}`
         }
       }
@@ -41,6 +41,18 @@ function readContentDir(subdir) {
     .filter(Boolean)
 }
 
+export function renderMarkdownContent(content) {
+  const tokens = marked.lexer(content)
+  const firstContentToken = tokens.findIndex(token => token.type !== 'space')
+  const firstToken = tokens[firstContentToken]
+
+  if (firstToken?.type === 'heading' && firstToken.depth === 1) {
+    tokens.splice(firstContentToken, 1)
+  }
+
+  return marked.parser(tokens)
+}
+
 function readMetaFile(filename) {
   const filepath = join(CONTENT_DIR, 'meta', filename)
   if (!existsSync(filepath)) return null

privat/CV/andreknie.de/plugins/vite-plugin-content.test.js

@@ -0,0 +1,19 @@
+import { describe, expect, it } from 'vitest'
+import { renderMarkdownContent } from './vite-plugin-content.js'
+
+describe('markdown content rendering', () => {
+  it('removes only an initial level-one heading', () => {
+    const html = renderMarkdownContent('# Duplicate title\n\nIntro\n\n## Section')
+
+    expect(html).not.toContain('<h1>Duplicate title</h1>')
+    expect(html).toContain('<p>Intro</p>')
+    expect(html).toContain('<h2>Section</h2>')
+  })
+
+  it('keeps content when no initial level-one heading exists', () => {
+    const html = renderMarkdownContent('Intro\n\n# Deliberate heading')
+
+    expect(html).toContain('<p>Intro</p>')
+    expect(html).toContain('<h1>Deliberate heading</h1>')
+  })
+})