Add MkDocs documentation portal with Material theme and CI/CD workflow

Co-authored-by: Fu-Jie <33599649+Fu-Jie@users.noreply.github.com>

requirements.txt

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+# MkDocs Documentation Dependencies
+# Core MkDocs
+mkdocs>=1.5.0
+
+# Material Theme for MkDocs
+mkdocs-material>=9.5.0
+
+# Plugins
+mkdocs-minify-plugin>=0.7.0
+
+# Optional: Multi-language support (uncomment if needed)
+# mkdocs-static-i18n>=1.0.0