routing: move config.routing to kallithea.controllers Routing doesn't belong in config. Having it there caused unfortunate dependencies. We do routing the old way. If we did it the new way, it would be defined in the root controller. But for now, we just place it next to the root controller.

pytest >= 4.6.6, < 5.5
pytest-sugar >= 0.9.2, < 0.10
pytest-benchmark >= 3.2.2, < 3.3
pytest-localserver >= 0.5.0, < 0.6
mock >= 3.0.0, < 4.1
Sphinx >= 1.8.0, < 3.1
WebTest >= 2.0.6, < 2.1
isort == 5.1.2
pyflakes == 2.2.0