freebuff: tweak copy, add philosophy section #5896

Job	Run time
build-and-check	3m 0s
test-integration-packages/billing	1m 11s
test-integration-packages/internal	1m 7s
test-integration-cli	47s
test-integration-web	40s
test-integration-common	43s
test-integration-packages/agent-runtime	43s
test-packages/internal	54s
test-.agents	37s
test-sdk	50s
test-common	43s
test-packages/agent-runtime	45s
test-packages/billing	45s
test-web	45s
test-integration-sdk	1m 18s
test-cli	1m 0s
	15m 48s

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