Add custom page templates for Home, Contact, and Services

- Created a new Contact Page template with a contact form and information section.
- Developed a Home Page template featuring a hero section, core capabilities, and pricing details.
- Introduced a Services Page template outlining core services and industry solutions.
- Added a default page template for standard pages without a custom template.
- Implemented a single post template for displaying individual blog posts.
- Created a style.css file for theme metadata and styling.

wp-content/themes/ots-signs/404.php

@@ -0,0 +1,23 @@
+<?php
+/**
+ * 404 Not Found template.
+ */
+get_header();
+?>
+
+<div class="page-header-light"></div>
+
+<section class="section" style="text-align:center;min-height:60vh;display:flex;align-items:center;">
+    <div class="container">
+        <div style="font-size:5rem;margin-bottom:1rem;">&#128269;</div>
+        <h1 style="font-size:clamp(3rem,8vw,6rem);color:var(--color-primary);line-height:1;">404</h1>
+        <h2 style="margin-bottom:1rem;">Page Not Found</h2>
+        <p class="lead" style="margin-bottom:2rem;">The page you're looking for doesn't exist or has been moved.</p>
+        <div class="btn-group" style="justify-content:center;">
+            <a href="<?php echo esc_url( home_url( '/' ) ); ?>" class="btn btn-primary">Back to Home</a>
+            <a href="<?php echo esc_url( home_url( '/contact' ) ); ?>" class="btn btn-outline">Contact Us</a>
+        </div>
+    </div>
+</section>
+
+<?php get_footer(); ?>