This is done in the 404 error page as it will match any invalid URL,
including `/forum/viewtopic.php`. We can't create a page with a custom
permalink set to `/forum/viewtopic.php`, as GitHub Pages doesn't set
the MIME type correctly, which causes the browser to download the page.
This closes#187.
The design has been slightly modernized in the process.
jQuery was also removed as it is no longer required, resulting in
faster page loading times.
Gallery thumbnails were regenerated at an higher resolution to match
the new design.
Hugo Locurcio
rubenwardy
Craig Davison