Migrate to python (#265)

* Add initial python migration

* Add pylint

* Add pre-commit

* Add Dockerfile

* Add expression matching

* Use shelve to store previous matches

* Add notifications

* Calculate post age

* Update README.md

rfd_notify/config.py

@@ -0,0 +1,19 @@
+import yaml
+from loguru import logger
+
+
+class Config:
+    def __init__(self, expressions):
+        self.expressions = expressions
+
+    def __repr__(self):
+        return f"Config(expressions={self.expressions})"
+
+
+def load_yaml_file(filename: str) -> Config:
+    with open(filename, "r", encoding="utf-8") as file:
+        try:
+            data = yaml.safe_load(file)
+        except yaml.YAMLError as err:
+            logger.error(f"Error loading config file: {err}")
+    return Config(**data)