Rework into a testable, modern app

tests/conftest.py

@@ -0,0 +1,13 @@
+import pytest
+import yaml
+
+from simple_webfinger.app import create_app
+
+
+@pytest.fixture(scope="module")
+def app():
+    app = create_app()
+    app.webfinger_config = yaml.load(
+        open("examples/example-config.yaml", "r"), yaml.SafeLoader
+    )
+    yield app