v0.0.4

• A session shows one question at a time. The earlier questions are a quiet list at the left, with the outcome of each. A click, or ⌥↑ and ⌥↓, opens one to read. On a narrow window the list folds.
• A session on one concept stays in its subject, and goes next to the concepts linked to it.
• Vault text shows raw HTML as text. A saved web page can no longer play a video or run code in the app.
• The app icon, the favicon and the docs icon.