Remove extraneous files; update themes submodule

- A preconfigured config.ini is probably not useful these days. There's
  an options menu now.
- Removed gs4 background - already in vanilla pack.
- Themes submodule should probably be configured to track master. Meh.
  Submodules can be so finicky. It probably doesn't belong in this repo
  anyway - it should be in the vanilla repo (currently invisible).

1 files changed, 0 insertions, 0 deletions

diff --git a/base/themes b/base/themes
-Subproject 49cc1265f55e2939248bc1eeb6be93a8a03b985
+Subproject 4b8496e7b6b0926fb9f4f6f13d86cd1da31b047