Make more easily configurable

Perhaps a tag factory is the best approach? If not, then inheritance is the way to go.

- [ ] Should be able to choose pygments colors
- [ ] Structure of output should be configurable

Start by locating the tag-generation and output-structure entry points in the project, then review how configuration is currently passed through. The issue leaves the tag factory versus inheritance design undecided. Done should include a documented way to choose Pygments colors and configure the output structure, with coverage for both options.

Written by the indexing model from the issue text.