Remove API Reference docs' sidebar #5124

Job	Run time
Install	28s
Lint	42s
Build Tests	49s
Default Tests	1m 10s
Floating Deps Test	1m 25s
Measure Asset Sizes	42s
Publish Docs to Cloudflare Pages	52s
typescript@4.8	39s
typescript@4.9	52s
typescript@5.0	50s
typescript@5.1	40s
typescript@5.2	52s
Post Preview URL as comment to PR	25s
ember-3.28	1m 1s
ember-4.0.0	1m 2s
ember-4.4	1m 2s
ember-4.8	1m 3s
ember-4.12	1m 1s
ember-release	1m 15s
ember-beta	1m 15s
ember-canary	1m 8s
embroider-safe	1m 18s
embroider-optimized	1m 3s
	21m 34s

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