Revert "chore: submodule"

This reverts commit ab83f9265d.

scripts/assets-push.sh

@@ -1,4 +1,9 @@
+
 cd assets
+git init
 git add .
-git commit -m 'update assets' --amend
+git commit -m 'update assets'
+git remote add origin git@github.com:mx-space/assets.git
+git branch -M master
 git push -u origin master -f
+rm -rf .git