web: Update hero tagline to "Better agents. Better code." #5537

Job	Run time
build-and-check	2m 25s
test-integration-packages/internal	1m 8s
test-integration-sdk	48s
test-integration-web	39s
test-integration-common	36s
test-integration-packages/billing	1m 10s
test-packages/billing	46s
test-.agents	43s
test-cli	1m 11s
test-sdk	48s
test-common	39s
test-packages/agent-runtime	1m 0s
test-web	50s
test-packages/internal	56s
test-integration-cli	37s
test-integration-packages/agent-runtime	41s
	14m 57s

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