Add separate page for Slate component in docs

docs/libraries/slate-react/slate.md

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+# Slate Component
+
+## `Slate(prop: SlateProps)`
+
+The `Slate` component must include somewhere in its `children` the `Editable` component.
+
+```typescript
+type SlateProps = {
+  editor: ReactEditor
+  value: Descendant[]
+  children: React.ReactNode
+  onChange?: (value: Descendant[]) => void
+}
+```
+
+### Slate Props
+
+#### `props.editor: ReactEditor`
+
+An instance of `ReactEditor`
+
+#### `props.value: Descendant[]`
+
+The initial value of the Editor.
+
+This prop is deceptively named.
+
+Slate once was a controlled component (i.e. it's contents were strictly controlled by the `value` prop) but due to features like its edit history which would be corrupted by direct editing of the `value` it is no longer a controlled component.
+
+#### `children: React.ReactNode`
+
+The `children` which must contain an `Editable` component.
+
+#### `onChange: (value: Descendant[]) => void`
+
+An optional callback function which you can use to be notified of changes in the editor's value.