Move header anchor styling into styleguide #338

Job	Run time
Floating Dependencies	2m 10s
Percy Tests	3m 41s
Tests	3m 46s
ember-lts-3.28	3m 26s
ember-release	4m 34s
ember-canary - Allowed to fail	3m 11s
ember-beta	3m 15s
ember-release-no-deprecations - Allowed to fail	4m 39s
ember-classic	4m 40s
ember-default-with-jquery	4m 29s
embroider-safe	3m 2s
embroider-optimized	4m 40s
no-deprecations	4m 28s
	50m 1s

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