internal: Improve handling of taxonomy term slugification. This paves the way to bring slugification options like transliteration to PieCrust. This change mostly makes sure we use one-way slugification, which means, for serving/previewing, we need to slugify each page's terms to compare to the stuff captured from the URL. It also simplifies things a bit in the code.

path_mode: absolute
files:
  - bower_components/jquery/dist/jquery.js
  - bower_components/bootstrap/js/transition.js
  - bower_components/bootstrap/js/collapse.js
  - bower_components/bootstrap/js/scrollspy.js