Implement building with docker

See the README for usages and details.

A breaking changes here too:
* run.py is gone, we now handle that kind of thing with docker
* The token is out of the config and is now an ENVAR (ideally using a .env)
* `.json` files are now in a .matchy/ subdirectory, as this makes it a lot easier for the container to safely read

Bonus:
* fix a score_factors.setdefault call causing issues
* Reformat some of the readme

.vscode/settings.json

@@ -7,5 +7,6 @@
     ],
     "python.testing.unittestEnabled": false,
     "python.testing.pytestEnabled": true,
-    "autopep8.interpreter": [".venv/bin/python"]
+    "autopep8.interpreter": [".venv/bin/python"],
+    "python.envFile": "${workspaceFolder}/.env",
 }