rewrite: Initial rewrite skeleton.

Remove modules that will no longer be required.
Move pending modules to pending-rewrite folders.

bot/modules/pending-rewrite/meta/__init__.py

@@ -0,0 +1,7 @@
+# flake8: noqa
+from .module import module
+
+from . import help
+from . import links
+from . import nerd
+from . import join_message