feat: scaffold Astro 7 with Tailwind 4, MDX, sitemap, node adapter and tooling

- Tailwind v4 via @tailwindcss/vite + typography plugin
- astro-icon (Tabler), self-hosted Rubik/Inter, RSS, Pagefind postbuild
- Prettier (astro + tailwind plugins), editorconfig
- new:post script with Turkish-aware slugify

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

astro.config.mjs

@@ -1,5 +1,25 @@
 // @ts-check
 import { defineConfig } from 'astro/config';
 
+import tailwindcss from '@tailwindcss/vite';
+import mdx from '@astrojs/mdx';
+import sitemap from '@astrojs/sitemap';
+import node from '@astrojs/node';
+import icon from 'astro-icon';
+
 // https://astro.build/config
-export default defineConfig({});
+export default defineConfig({
+  site: 'https://ta1sph.info',
+  trailingSlash: 'always',
+  // Static by default; only routes with `export const prerender = false` (view counter API) run on the server.
+  output: 'static',
+  adapter: node({ mode: 'standalone' }),
+  integrations: [
+    mdx(),
+    sitemap({ filter: (page) => !page.includes('/_styleguide/') }),
+    icon({ include: { tabler: ['*'] } }),
+  ],
+  vite: {
+    plugins: [tailwindcss()],
+  },
+});