refactor: work around os.environ missing in micropython

Work with micropython, but keep ability to override values with
enviromental variables (for possible running in k8s).

config.py

@@ -1,20 +1,15 @@
 
-import os
+LATITUDE = "…"
+LONGITUDE = "…"
 
-def configure_env():
-    """ exports environment variables with configuration """
+GOOGLE_API_KEY = "…"
+TRAFFIC_FROM = "…+FM"
+#["TRAFFIC_FROM = f"${LATITUDE}-${LONGITUDE}"
+TRAFFIC_1_THROUGH = "…+4FP"
+TRAFFIC_2_THROUGH = "…+V9J"
+TRAFFIC_TO = "…+GX"
 
-    os.environ["LATITUDE"] = "…"
-    os.environ["LONGITUDE"] = "…"
+AIRLY_API_KEY = "…"
 
-    os.environ["GOOGLE_API_KEY"] = "…"
-    os.environ["TRAFFIC_FROM"] = "…+FM"
-    #os.environ["TRAFFIC_FROM"] = f"${LATITUDE}-${LONGITUDE}"
-    os.environ["TRAFFIC_1_THROUGH"] = "…+4FP"
-    os.environ["TRAFFIC_2_THROUGH"] = "…+V9J"
-    os.environ["TRAFFIC_TO"] = "…+GX"
-
-    os.environ["AIRLY_API_KEY"] = "…"
-
-    os.environ["OPENWEATHERMAP_API_KEY"] = "…"
+OPENWEATHERMAP_API_KEY = "…"