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>

templates/index.html

@@ -0,0 +1,10 @@
+<!-- wp:template-part {"slug":"header"} /-->
+
+<!-- wp:group {"tagName":"main","style":{"spacing":{"margin":{"top":"var:preset|spacing|60"}}},"layout":{"type":"constrained"}} -->
+<main class="wp-block-group" style="margin-top:var(--wp--preset--spacing--60)">
+	<!-- wp:pattern {"slug":"wp-bootstrap/hidden-blog-heading"} /-->
+	<!-- wp:pattern {"slug":"wp-bootstrap/template-query-loop"} /-->
+</main>
+<!-- /wp:group -->
+
+<!-- wp:template-part {"slug":"footer"} /-->