Add comprehensive documentation for all project sections

Introduced new and updated documentation files across the docs/ directory, including project structure guides, function library references, and standardized READMEs for ct, install, vm, tools, api, and misc. This update fully documents all nine function libraries, provides quick start and learning paths, and mirrors the project structure for easier navigation and contribution.

docs/misc/cloud-init.func/CLOUD_INIT_FUNC_FUNCTIONS_REFERENCE.md

@@ -0,0 +1,30 @@
+# cloud-init.func Functions Reference
+
+Cloud-init and VM provisioning functions.
+
+## Core Functions
+
+### generate_cloud_init()
+Generate cloud-init configuration.
+
+### generate_user_data()
+Generate user-data script for VM.
+
+### apply_cloud_init()
+Apply cloud-init to VM.
+
+### setup_ssh_keys()
+Deploy SSH public keys.
+
+### setup_static_ip()
+Configure static IP on VM.
+
+### setup_dns()
+Configure DNS for VM.
+
+### setup_ipv6()
+Enable IPv6 on VM.
+
+---
+
+**Last Updated**: December 2025