Remove Spacemacs and Chemacs submodules

My vanilla emacs config is now the only config I have.

.gitmodules

@@ -1,9 +1,3 @@
 [submodule ".config/tmux"]
         path = .config/tmux
         url = git@github.com:gpakosz/.tmux.git
-[submodule ".emacs.d"]
-        path = .emacs.d
-        url = git@github.com:plexus/chemacs2.git
-[submodule ".emacs.spacemacs"]
-        path = .emacs.spacemacs
-        url = git@github.com:syl20bnr/spacemacs.git