use env variables instead of config.toml

Author: artcz

src/config.py

@@ -1,4 +1,8 @@
-import tomllib
+import os
 
-with open("config.toml", "rb") as fd:
-    conf = tomllib.load(fd)
+# with open("config.toml", "rb") as fd:
+#     conf = tomllib.load(fd)
+
+conf = {
+    "pretalx-token": os.environ["PRETALX_TOKEN"],
+}