Revert "Fix `generator` tag issue"

This reverts commit d73eb1413cf8e179cf5e6dd3de479956b8f10925.
Revert "Update License"

This reverts commit 0babe445b352bbdedfce2dc07e951205c8d0d2d2.
Revert "Update submodules"

This reverts commit 95dc9983b44052fbc6e84088efa092d65703f136.
Revert "Update _config.yml"

This reverts commit bee8604c99e279b2d78462278721bde16a610737.
Revert "Change `_layouts` and `_includes` to submodules"

This reverts commit ac81e433be4c7e2a158ab769e95ec8e524a6eb52.
That didn't work AT ALL!