docs(push-notifications): update README to reflect banner and list An… #5712

Job	Run time
setup (macos-15)	1m 7s
setup (ubuntu-latest)	46s
lint-scripts	22s
lint (push-notifications)	28s
verify-ios (/Applications/Xcode_26.0.app, push-notifications)	1m 13s
verify-web (push-notifications)	21s
verify-android (push-notifications)	2m 1s
	6m 18s

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