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.bak.20260210/includes/header.php

@@ -0,0 +1,28 @@
+<!-- Navigation -->
+<nav class="navbar" id="navbar">
+    <div class="nav-container">
+        <div class="nav-logo">
+            <a href="/">
+                <picture>
+                    <source srcset="/assets/images/ukds-main-logo.webp" type="image/webp">
+                    <img src="/assets/images/ukds-main-logo.png" alt="UK Data Services" class="logo">
+                </picture>
+            </a>
+        </div>
+        <div class="nav-menu" id="nav-menu">
+            <a href="/" class="nav-link">Home</a>
+            <a href="/#services" class="nav-link">Services</a>
+            <a href="/project-types" class="nav-link">Project Types</a>
+            <a href="/about" class="nav-link">About</a>
+            <a href="/tools/" class="nav-link">Free Tools</a>
+            <a href="/blog/" class="nav-link">Blog</a>
+            <a href="/#contact" class="nav-link">Contact</a>
+            <a href="/quote" class="nav-link cta-button">Request Consultation</a>
+        </div>
+        <button class="nav-toggle" id="nav-toggle" aria-expanded="false" aria-controls="nav-menu" aria-label="Toggle navigation menu">
+            <span class="bar"></span>
+            <span class="bar"></span>
+            <span class="bar"></span>
+        </button>
+    </div>
+</nav>