use sidebar styles from ember-styleguide #276

Job	Run time
Tests	1m 52s
Floating Dependencies	3m 22s
Linting	1m 8s
ember-beta - Allowed to fail	3m 14s
ember-try: ember-lts-3.20	2m 27s
ember-canary - Allowed to fail	3m 7s
ember-try: ember-lts-3.24	3m 1s
ember-release-no-deprecations - Allowed to fail	3m 6s
ember-try: ember-lts-3.28	2m 37s
ember-try: ember-release	3m 1s
ember-try: ember-default-with-jquery	3m 37s
ember-try: ember-classic	2m 38s
ember-try: embroider-safe	2m 44s
ember-try: embroider-optimized	2m 48s
ember-try: no-deprecations	2m 33s
	41m 15s

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