website/docs: add scaling page #24363

Job	Run time
test-migrations	3m 2s
lint (bandit)	2m 3s
test-migrations-from-stable - PostgreSQL 15-alpine	16m 53s
test-integration	5m 33s
lint (black)	1m 57s
test-migrations-from-stable - PostgreSQL 16-alpine	17m 12s
lint (codespell)	1m 58s
lint (pending-migrations)	1m 58s
test-unittest - PostgreSQL 15-alpine	15m 53s
lint (ruff)	2m 24s
test-unittest - PostgreSQL 16-alpine	15m 35s
test-e2e (proxy)	5m 11s
test-e2e (oauth)	7m 50s
test-e2e (oauth-oidc)	6m 8s
test-e2e (saml)	6m 36s
test-e2e (ldap)	9m 32s
test-e2e (radius)	4m 45s
test-e2e (scim)	4m 2s
test-e2e (flows)	5m 4s
ci-core-mark	1s
build (amd64)	10m 23s
build (arm64)	19m 48s
pr-comment	6s
	2h 43m 54s

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