Refactor configuration file loading to check multiple paths and raise error if not found

hasspy/__main__.py

@@ -1,5 +1,6 @@
 import logging
 import tomllib
+from pathlib import Path
 
 from hasspy.mqtt import HassClient
 
@@ -7,7 +8,18 @@ from hasspy.mqtt import HassClient
 def main() -> None:
     logging.basicConfig(level=logging.INFO)
 
-    with open("/etc/hasspy/config.toml", "rb") as file:
+    config_file = next(
+        (
+            x
+            for x in (Path("/etc/hasspy.toml"), Path("/etc/hasspy/config.toml"))
+            if x.exists()
+        ),
+        None,
+    )
+    if not config_file:
+        raise FileNotFoundError("No configuration file found")
+
+    with open(config_file, "rb") as file:
         config = tomllib.load(file)
 
     ha = HassClient(