Remove Config class

If the config class was to replace the config dict,
further refactorings upstream would be needed.
This is out of scope.

domain.py

@@ -1,11 +1,6 @@
 from enum import Enum
 from pathlib import Path
 
-class Config():
-    def __init__(self, main_branch):
-        pass
-
-
 class ReleaseType(Enum):
     MAJOR = 0
     MINOR = 1
@@ -13,7 +8,6 @@ class ReleaseType(Enum):
     SNAPSHOT = 3
     BUMP = None
 
-
 class Version():
 
     def __init__(self, id: Path, version_list: list):
@@ -60,7 +54,6 @@ class Version():
         bump_version.increment(ReleaseType.BUMP)
         return bump_version
 
-
 class Release():
     def __init__(self, release_type: ReleaseType, version: Version, current_branch: str):
         self.release_type = release_type