Update all snippets to new format

snippets/UncontrolledInput.md

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+---
+title:  UncontrolledInput
+tags: input,beginner
+---
+
+Renders an `<input>` element that uses a callback function to pass its value to the parent component.
+
+* Use object destructuring to set defaults for certain attributes of the `<input>` element.
+* Render an `<input>` element with the appropriate attributes and use the `callback` function in the `onChange` event to pass the value of the input to the parent.
+
+```jsx
+function UncontrolledInput({ callback, type = 'text', disabled = false, readOnly = false, placeholder = '' }) {
+  return (
+    <input
+      type={type}
+      disabled={disabled}
+      readOnly={readOnly}
+      placeholder={placeholder}
+      onChange={({ target: { value } }) => callback(value)}
+    />
+  );
+}
+```
+
+```jsx
+ReactDOM.render(
+  <UncontrolledInput type="text" placeholder="Insert some text here..." callback={val => console.log(val)} />,
+  document.getElementById('root')
+);
+```