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/alpine-install.func/ALPINE_INSTALL_FUNC_FUNCTIONS_REFERENCE.md

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+# alpine-install.func Functions Reference
+
+Alpine Linux-specific installation functions (apk-based, OpenRC).
+
+## Core Functions
+
+### setting_up_container()
+Initialize Alpine container setup.
+
+### update_os()
+Update Alpine packages via `apk update && apk upgrade`.
+
+### verb_ip6()
+Enable IPv6 on Alpine with persistent configuration.
+
+### network_check()
+Verify network connectivity in Alpine.
+
+### motd_ssh()
+Configure SSH daemon and MOTD on Alpine.
+
+### customize()
+Apply Alpine-specific customizations.
+
+### cleanup_lxc()
+Final cleanup (Alpine-specific).
+
+---
+
+**Last Updated**: December 2025