docs: enhance dynamic-remotes example documentation and modernization guide #4930

Job	Run time
stop-previous-run	5s
forked_master_status	51s
save-env	4s
setup-matrix	4m 2s
run-e2e-test (dynamic-remotes)	3m 30s
run-e2e-test (module-federation-examples-root)	2m 11s
run-e2e-test (advanced-apis)	2m 4s
	12m 47s

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