Revert "for now, check-in archives by hand (#384)"

This reverts commit 4f65bf3.

It's probably best to simply keep all archives as no matter what,
it will be faster and is desirable.

Author: Byron

.gitignore

@@ -8,4 +8,3 @@ target/
 /tests/fixtures/repos
 
 **/generated-do-not-edit/
-**/generated-archives/*.tar.xz