Add core 404, search, and archive standard templates

404.php

@@ -0,0 +1,32 @@
+<?php
+/**
+ * The template for displaying 404 pages (not found)
+ */
+
+get_header();
+?>
+
+<main id="primary" class="site-main container text-center my-5 py-5">
+    <section class="error-404 not-found d-flex flex-column align-items-center justify-content-center"
+        style="min-height: 50vh;">
+        <h1 class="display-1 fw-bold font-serif text-primary mb-3">404</h1>
+        <h2 class="h3 font-sans mb-4">Page Not Found</h2>
+        <p class="lead text-muted font-sans mb-5 w-75 mx-auto">
+            <?php esc_html_e('It looks like nothing was found at this location. Perhaps searching can help.', 'wisdom1'); ?>
+        </p>
+
+        <div class="search-container w-100" style="max-width: 500px;">
+            <?php get_search_form(); ?>
+        </div>
+
+        <div class="mt-5">
+            <a href="<?php echo esc_url(home_url('/')); ?>"
+                class="btn btn-secondary btn-lg px-4 fs-6 text-uppercase fw-bold rounded-pill shadow-sm">
+                Return to Home
+            </a>
+        </div>
+    </section><!-- .error-404 -->
+</main><!-- #main -->
+
+<?php
+get_footer();