Change InstantClick to whitelist

InstantClick is now whitelisting not blacklisting.
This means:
<a data-instant href="..."> instead of <a href="...">
<a href="..."> instead of <a data-no-instant href="...">

This was because I have more external links than internal links. This will also ensure that any external links are not loaded by InstantClick to make sure any potential issues do not occur.