feat(01-02): create lab directory structure with placeholder READMEs

- Created labs/ directory with 5 lab subdirectories
- Created how-to-guides/ and reference/ directories
- Added placeholder README.md in each lab directory

labs/lab-01-iam/README.md

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+# Lab 01: IAM & Sicurezza
+
+Coming soon.
+
+This lab will cover: Configurazione utenti Linux, permessi Docker socket, capisci i paralleli IAM.

labs/lab-02-network/README.md

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+# Lab 02: Network & VPC
+
+Coming soon.
+
+This lab will cover: Creare reti Docker isolate che simulano VPC e Subnets cloud.

labs/lab-03-compute/README.md

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+# Lab 03: Compute & EC2
+
+Coming soon.
+
+This lab will cover: Deploy container con limiti CPU/memoria e healthchecks.

labs/lab-04-storage/README.md

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+# Lab 04: Storage & S3
+
+Coming soon.
+
+This lab will cover: Configura Docker Volumes e MinIO per storage S3-compatible.

labs/lab-05-database/README.md

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+# Lab 05: Database & RDS
+
+Coming soon.
+
+This lab will cover: Deploy PostgreSQL in rete privata con persistenza dati.