Changed links to point to correct github repo.

You may also want to update 

```
<span class="item">
<a href="pgpsignedmsg.txt" target="_blank">
<span id="footerlabelversion">Version History</span> (v2.6.0)</a>
(<a href="ninja_bitaddress.org.txt" target="_blank" id="footerlabelpgp">PGP</a>)
</span>
```

To contain a version history signed with your PGP key. The links as is are dead.

There is also a bitcoin donation address that you *could* update if you wanted to :)

Cheers,
Max