rewrite: More restructuring.

tests/gui/cards/goal_sample.py

@@ -0,0 +1,12 @@
+import asyncio
+import datetime as dt
+from src.cards import WeeklyGoalCard
+
+
+async def get_card():
+    card = await WeeklyGoalCard.generate_sample()
+    with open('samples/weekly-sample.png', 'wb') as image_file:
+        image_file.write(card.fp.read())
+
+if __name__ == '__main__':
+    asyncio.run(get_card())