improved markdown conversion

docs/news/03-draft.md

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+# HTML custom elements and reinventing Processing.js
+
+- `<graphics-element>`
+- BaseAPI + GraphicsAPI
+- `<fallback-image>
+    - generate snapshot of first frame
+    - canvas in Node!
+    - image filename hashed based on file-content
+    - store in images/chapter/... or images/news/...
+    - lazy loading for if there is no JS
+- if JS, IntersectionObserver on the graphics element
+
+- Styling: `:defined` to the rescue
+
+- Why not `extends HTMLCanvasElement`?
+    - node + browser