Search toggle icon on mobile, 2-col desktop; update README badges

Search position:
- Desktop: 2 columns (16.667%), menu fills the rest
- Mobile: collapses to a magnifying glass icon button (like the
  hamburger) that expands the search form via Bootstrap collapse

README:
- Version moved to badge (03.09.04)
- Joomla badge updated to 5.x | 6.x
- PHP badge updated to 8.1+
- Removed inline VERSION from title

Remove obsolete build-release.sh and minify.js scripts (replaced
by CI workflow and PHP helper).

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

README.md

@@ -13,13 +13,14 @@
  BRIEF: Documentation for MokoCassiopeia template
  -->
 
-# README - MokoCassiopeia (VERSION: 03.09.03)
+# MokoCassiopeia
 
 **A Modern, Lightweight Joomla Template Based on Cassiopeia**
 
+[![Version](https://img.shields.io/badge/version-03.09.04-green.svg)](https://github.com/mokoconsulting-tech/MokoCassiopeia/releases/tag/v03)
 [![License: GPL v3](https://img.shields.io/badge/License-GPLv3-blue.svg)](https://www.gnu.org/licenses/gpl-3.0)
-[![Joomla](https://img.shields.io/badge/Joomla-4.4.x%20%7C%205.x-blue.svg)](https://www.joomla.org)
-[![PHP](https://img.shields.io/badge/PHP-8.0%2B-blue.svg)](https://www.php.net)
+[![Joomla](https://img.shields.io/badge/Joomla-5.x%20%7C%206.x-blue.svg)](https://www.joomla.org)
+[![PHP](https://img.shields.io/badge/PHP-8.1%2B-blue.svg)](https://www.php.net)
 
 MokoCassiopeia is a modern, lightweight enhancement layer built on top of Joomla's Cassiopeia template. It adds **Font Awesome 7**, **Bootstrap 5** helpers, an automatic **Table of Contents (TOC)** utility, advanced **Dark Mode** theming, and optional integrations for **Google Tag Manager** and **Google Analytics (GA4)**—all while maintaining minimal core template overrides for maximum upgrade compatibility.