Replace site name with image instead.

[kishjayson]

Would like the ability to substitute the site name in navigation.html with an image instead. I was able to accomplish this by using the updated code below, but I'm not sure if there's a more elegant solution available.

<a href="{{ '/' | relative_url }}" class="header-logo" title="{{ site.name }}"><img src="/assets/image-name-here.png" alt="Image Name Here" width="350"></a>

[kishjayson]

I also did something similar on the 404.html page as well.

<h1><img src="/assets/image-name-here.png" alt="Image Name Here" width="130"/></h1>