Serlo Editor experiments

• 2026-08-16-multiple-choice-edit-view
• 2026-08-16-multiple-choice-exercise-with-public-api
• 2026-09-18-vibecoded-experiment
• 2026-10-02-tiptap-split-editor
• 2026-10-05-current-prototype
• 2026-10-23-prototype-with-new-storage
• 2026-10-24-current-prototype-with-new-design
• 2026-10-24-designed-prototype-with-new-storage