fix(templates/application): Add alt text for the "For me on GitHub" link
{{google-jsapi}}
<a href='https://github.com/rust-lang/crates.io' class='fork-me'>
- <img src='/assets/forkme.png'/>
+ <img src='/assets/forkme.png'/ alt="Fork me on GitHub">
</a>
<nav id="header">
