Fold/toggle header

General
7 
```space-script
silverbullet.registerEventListener({name: "editor:pageLoaded"}, async () => {
  const text = await editor.getText();
  if(!text.startsWith("---")) {
    console.log("No frontmatter, skipping folding");
    return;
  }
  const pos = await editor.getCursor();
  await editor.moveCursor(0);
  await editor.fold();
  await editor.moveCursor(pos);
  console.log("Folded frontmatter.")
});
```

Seems to do it. It may have a side effect of always scrolling the page a bit, depending on the cursor position, but perhaps that’s acceptable.

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