Site improvements: nav refactor, CSS readability, hover fixes, remove unverified badges

- Refactored navigation: all 44 pages now use shared includes/nav.php
- Added Free Tools link to navigation (was missing from 29+ pages)
- CSS readability: darker body text (#333), secondary text (#555), bolder hero subtitle
- CSS: darkened link colour (#148a72) for WCAG AA compliance
- CSS: increased stat label font size to 1rem
- Fixed industry-card hover white-on-white text bug
- Removed ICO Registered and Cyber Essentials claims (not yet registered)
- Cache version bumped to v1.1.2

services/web-scraping.php

@@ -609,7 +609,6 @@ $breadcrumbs = [
                     <span>🔒 GDPR Compliant</span>
                 </div>
                 <div class="trust-badge">
-                    <span>📋 ICO Registered</span>
                 </div>
                 <div class="trust-badge">
                     <span>🇬🇧 UK Based</span>