Delete Category pages

gitit will generate them.
Replace Prey page with proper page

it just redirected to some spam page.. I dug out the last version
without spam.
Manually remove some spam-links

.. the ones I can't get automatically by matching the two most offending
domains
Remove some more (better hidden) spam
Update metadata
Add generated contents in html-ish format

this can be used to convert to markdown with pandoc, but first
we'll need to fix the images