Add standalone /subscribe page which only has buttons to subscribe. R… #5764

Job	Run time
build-and-check	2m 47s
test-integration-packages/billing	1m 0s
test-integration-packages/internal	1m 10s
test-integration-cli	39s
test-integration-web	47s
test-integration-packages/agent-runtime	39s
test-integration-sdk	38s
test-integration-common	40s
test-web	41s
test-common	47s
test-cli	44s
test-sdk	49s
test-packages/billing	40s
test-.agents	48s
test-packages/agent-runtime	48s
test-packages/internal	46s
	14m 23s

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