feat(docs, ui): restructure frontend documentation & introduce Vision directories for modularity

- Moved existing FIGMA-related files into `Vison_01` and `Vision_02` folders to better support versioning and collaboration.
- Added PostCSS configuration for extending plugins in Tailwind CSS.
- Introduced new style guidelines, theme configurations, and modular imports for `Vision_02`.
- Documented detailed ÖTO tournament structures and parameters for CSN/CDN inclusions.
- Enhanced routing and UI files for future scalability, including new `theme.tsx` and `routes.tsx`.

Signed-off-by: Stefan Mogeritsch <stefan.mo.co@gmail.com>

docs/06_Frontend/FIGMA/Vision_02/postcss.config.mjs

@@ -0,0 +1,15 @@
+/**
+ * PostCSS Configuration
+ *
+ * Tailwind CSS v4 (via @tailwindcss/vite) automatically sets up all required
+ * PostCSS plugins — you do NOT need to include `tailwindcss` or `autoprefixer` here.
+ *
+ * This file only exists for adding additional PostCSS plugins, if needed.
+ * For example:
+ *
+ * import postcssNested from 'postcss-nested'
+ * export default { plugins: [postcssNested()] }
+ *
+ * Otherwise, you can leave this file empty.
+ */
+export default {}