Further cleanup

* Removes (partly) the ArchivingOrchestrator
* Removes the cli_feeder module, and makes it the 'default', allowing you to pass URLs directly on the command line, without having to use the cumbersome --cli_feeder.urls. Just do auto-archiver https://my.url.com
* More unit tests
* Improved error handling

src/auto_archiver/core/context.py

@@ -53,12 +53,4 @@ class ArchivingContext:
         if full_reset: ac.keep_on_reset = set()
         ac.configs = {k: v for k, v in ac.configs.items() if k in ac.keep_on_reset}
 
-    # ---- custom getters/setters for widely used context values
-
-    @staticmethod
-    def set_tmp_dir(tmp_dir: str):
-        ArchivingContext.get_instance().configs["tmp_dir"] = tmp_dir
-
-    @staticmethod
-    def get_tmp_dir() -> str:
-        return ArchivingContext.get_instance().configs.get("tmp_dir")
+    # ---- custom getters/setters for widely used context values