remove imports.scss stylesheet within bundles
remove imports.scss stylesheet within bundles

Fixes: CNVS-26580

test plan:
- compile assets - should not see any errors alerting that
  a style is missing with the removal of this

Change-Id: Ia480d1ea8b60bbca8ae274d08edce703d3477426
Reviewed-on: https://gerrit.instructure.com/71084
Tested-by: Jenkins
Reviewed-by: Colleen Palmer <387ba1943871e60965e6b44638a2f2e1ab9b8469@instructure.com>
Product-Review: Colleen Palmer <387ba1943871e60965e6b44638a2f2e1ab9b8469@instructure.com>
QA-Review: Myller de Araujo <e5c7c5e1b7f2ce5e9870cc98ec52b20b3006cb48@instructure.com>

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