Remove DIGG

This remove digg toolkit which is not supported anymore and returns 404.

There's also tons of links to hyphenate.js and (less) to hyphenate_selectively.js, which IIRC had been removed because they slowed the site down, however they're still in the DDOC. I didn't fix it because I have basically 0 knowledge in DDOC / web, but should be pretty straightforward.