remove hard-coded git-url & minor restructuring

lib/config.py

@@ -0,0 +1,28 @@
+import json
+from pathlib import Path
+from dataclasses import dataclass
+
+@dataclass
+class Config(object):
+    discord_token: str | None = None
+    discord_guild_id: int | None = None
+    git_branch: str | None = None
+    git_url: str | None = None
+
+def config_decoder(obj):
+    if '__type__' in obj and obj['__type__'] == "Config":
+        return Config(
+            discord_token=obj['discord_token'],
+            discord_guild_id=obj['discord_guild_id'],
+            git_branch=obj['git_branch'],
+            git_url=obj['git_url']
+        )
+
+def save_config(config: dict):
+    with Path("config.json").open("w+", encoding="utf-8") as fp:
+        json.dump(config, fp, indent=4)
+
+def load_config():
+    with Path("config.json").open("r", encoding="utf-8") as fp:
+        config = json.load(fp, object_hook=config_decoder)
+    return config