docs(enterprise): add Custom Blocks page (#5515) #21460

Job	Run time
Detect Version	4s
Test and Build / Test and Build	7m 1s
Migrate Dev DB	-1s
Check Docs Changes	-1s
Deploy Trigger.dev (Dev)	-1s
Build Dev ECR	0s
Build ARM64 (GHCR Only)	0s
Migrate DB / Apply Database Migrations	39s
Build AMD64 (./docker/app.Dockerfile, ghcr.io/simstudioai/simstudio, ECR_APP)	5m 27s
Build AMD64 (./docker/pii.Dockerfile, ghcr.io/simstudioai/pii, ECR_PII)	1m 47s
Build AMD64 (./docker/realtime.Dockerfile, ghcr.io/simstudioai/realtime, ECR_REALTIME)	1m 5s
Build AMD64 (./docker/db.Dockerfile, ghcr.io/simstudioai/migrations, ECR_MIGRATIONS)	1m 5s
Process Docs	0s
Create GHCR Manifests	0s
Create GitHub Release	0s
	17m 5s

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