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<head> docs reference (withastro#301)
This might deserve a section on another page like `/component-syntax`, but it's a start.
"Just use `<head>`" doesn't convey that Astro doesn't duplicate `<head>` elements in child components of layouts in a way that `react-helmet` does
It was a bit confusing wording wise equating the two, so I added a caveat.
From what I understand, the current recommendation to add to `<head>` from a lower component is:
```astro
// MainLayout.astro
<HTML>
<head>
<title>tada this is my title in regular head</title>
<slot name="head/>
</head>
<body>
<main>
<slot/>
</main>
</body>
</html>
```
and then in `Component.astro`
```astro
<Fragment slot="head">
<title>this is a different title now :D</title>
</Fragment>
```- Loading branch information
