bug: slugs are not used for addresses

This is not the most pressing thing in the world, but is a little annoying. I would like to have clean addresses when the structure is complete, just makes it a bit easier for sharing and cleaner. And changing is painful when the page already has disqus comments.

The issue names no file, test, or entry point. Start by locating how the website builds page addresses and determine the expected slug format; done means completed pages use clean, stable addresses without losing existing Disqus comments.

Written by the indexing model from the issue text.