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-tools.func/ALPINE_TOOLS_FUNC_FUNCTIONS_REFERENCE.md

@@ -0,0 +1,31 @@
+# alpine-tools.func Functions Reference
+
+Alpine-specific tool installation functions.
+
+## Core Functions
+
+### apk_update()
+Update Alpine package lists.
+
+### apk_add(PACKAGES)
+Install Alpine packages.
+
+### apk_del(PACKAGES)
+Remove Alpine packages.
+
+### add_community_repo()
+Enable Alpine community repository.
+
+### add_testing_repo()
+Enable Alpine testing repository.
+
+### Alpine Tool Functions
+- `setup_nodejs()` - Alpine Node.js
+- `setup_php()` - Alpine PHP
+- `setup_mariadb()` - Alpine MariaDB
+- `setup_postgresql()` - Alpine PostgreSQL
+- (+ more Alpine-specific setups)
+
+---
+
+**Last Updated**: December 2025