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

includes/footer.php

@@ -67,14 +67,12 @@
                 <div class="trust-badge">
                     <div class="trust-badge-icon">📋</div>
                     <div class="trust-badge-text">
-                        <strong>ICO Registered</strong>
                         <span>Registration: ZA123456</span>
                     </div>
                 </div>
                 <div class="trust-badge">
                     <div class="trust-badge-icon">🛡️</div>
                     <div class="trust-badge-text">
-                        <strong>Cyber Essentials</strong>
                         <span>UK Government backed scheme</span>
                     </div>
                 </div>