feat: base Astro template for RU market

- Astro config with RSS, sitemap
- Pagefind search integration
- Schema.org structured data
- JSON Feed
- 10 starter pages (home, about, blog)
- 6 blog post templates
- llms.txt for LLM consumption
- bun package manager
- .gitignore (node_modules, dist, .astro)

.gitignore

@@ -0,0 +1,6 @@
+node_modules/
+dist/
+.astro/
+.env
+*.log
+.DS_Store