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_USAGE_EXAMPLES.md

@@ -0,0 +1,19 @@
+# alpine-tools.func Usage Examples
+
+Examples for Alpine tool installation.
+
+### Example: Alpine Setup with Tools
+
+```bash
+#!/usr/bin/env bash
+source /dev/stdin <<<"$FUNCTIONS_FILE_PATH"
+
+apk_update
+setup_nodejs "20"
+setup_php "8.3"
+setup_mariadb "11"
+```
+
+---
+
+**Last Updated**: December 2025