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/__main__.py

@@ -3,7 +3,7 @@ from auto_archiver.core.orchestrator import ArchivingOrchestrator
 import sys
 
 def main():
-    ArchivingOrchestrator().run(sys.argv)
+    ArchivingOrchestrator().run(sys.argv[1:])
 
 if __name__ == "__main__":
     main()