Initial theme scaffolding (v0.0.1)

- Bootstrap 5 CSS/JS integration via Yarn (served locally)
- Dart Sass build pipeline with PostCSS, Autoprefixer, cssnano
- Twig 3.0 via Composer with PSR-4 autoloading
- FSE block theme templates (index, home, single, page, archive, search, 404)
- Template parts (header, footer) and block patterns
- theme.json with Bootstrap 5-aligned design tokens
- Gitea CI/CD workflow for automated release packages
- WordPress i18n support (en_US base, de_CH translation)

Co-Authored-By: Claude <noreply@anthropic.com>

patterns/post-navigation.php

@@ -0,0 +1,20 @@
+<?php
+/**
+ * Title: Post navigation
+ * Slug: wp-bootstrap/post-navigation
+ * Categories: posts
+ * Description: Previous and next post links.
+ *
+ * @package WPBootstrap
+ * @since 0.0.1
+ */
+?>
+<!-- wp:group {"style":{"spacing":{"padding":{"top":"var:preset|spacing|60","bottom":"var:preset|spacing|60"}}},"layout":{"type":"constrained"}} -->
+<div class="wp-block-group" style="padding-top:var(--wp--preset--spacing--60);padding-bottom:var(--wp--preset--spacing--60)">
+	<!-- wp:separator {"className":"is-style-wide"} -->
+	<hr class="wp-block-separator has-alpha-channel-opacity is-style-wide"/>
+	<!-- /wp:separator -->
+	<!-- wp:post-navigation-link {"type":"previous","label":"<?php esc_attr_e( 'Previous', 'wp-bootstrap' ); ?>","arrow":"arrow"} /-->
+	<!-- wp:post-navigation-link {"label":"<?php esc_attr_e( 'Next', 'wp-bootstrap' ); ?>","arrow":"arrow"} /-->
+</div>
+<!-- /wp:group -->