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docs: refresh quickstart and README for current ng add and deploy paths #2781

Job	Run time
Build	1m 0s
Contribute Node 20 (macos-latest)	3m 3s
Contribute Node 20 (ubuntu-latest)	2m 46s
Contribute Node 20 (windows-latest)	6m 37s
Test chrome-headless	2m 5s
Test firefox-headless	1m 47s
Test Node 24 (macos-latest)	55s
Test Node 24 (ubuntu-latest)	54s
Test Node 20 (macos-latest)	1m 8s
Test Node 22 (ubuntu-latest)	49s
Test Node 22 (windows-latest)	1m 40s
Test Node 24 (windows-latest)	1m 42s
Test Node 20 (ubuntu-latest)	1m 1s
Test Node 22 (macos-latest)	1m 5s
Test Node 20 (windows-latest)	1m 40s
Publish (NPM)	0s
Branch protection	3s
	28m 15s