Fix packaging logging.conf.

I note that the application will not run in a local environment UNLESS
run with a working directory that is the root of the repo.

MANIFEST.in

@@ -1,4 +1,4 @@
-recursive-include imagedephi *.yaml *.j2
+recursive-include imagedephi *.yaml *.j2 logging.conf
 
 prune .github
 prune docs

imagedephi/utils/logger.py

@@ -1,6 +1,15 @@
+import importlib.resources
 import logging
 import logging.config
+import os
 
-logging.config.fileConfig("logging.conf")
+try:
+    logging.config.fileConfig(
+        "logging.conf"
+        if os.path.exists("logging.conf")
+        else importlib.resources.files("imagedephi") / "logging.conf"
+    )
+except KeyError:
+    pass
 
 logger = logging.getLogger("root")