Optionally, adding the `logo` prop to an item will shove it over to the left side of the nav.

```
<Nav>
  <Nav.Item logo>
    <h1>Logo</h1>
  </Nav.Item>
  <Nav.Item>
    <a href="/">Home</a>
  </Nav.Item>
  <Nav.Item>
    <a href="/">About</a>
  </Nav.Item>
  <Nav.Item>
    <a href="/">Contact</a>
  </Nav.Item>
  <Nav.Item>
    <a href="/contact">Contact</a>
  </Nav.Item>
</Nav>
```