feat: Implement various Astro integrations and configurations

- Update `astro.config.mjs` file
- Set `site` value to `"https://tpougy.blog"`
- Add `astroExpressiveCode` integration with plugins `pluginLineNumbers()` and `pluginCodeOutput()`
- Add themes `"dracula"` and `"github-light"` to `astroExpressiveCode`
- Implement `themeCssSelector` method to select themes based on their type
- Integrate `pluginLineNumbers`
- Enable `mdx` integration
- Enable `sitemap` integration
- Enable `tailwind` integration
- Enable `svelte` integration
- Add `icon` integration with specified icons for `lineMd` and `iconoir`
- Integrate `pagefind`
- Specify external module for `rollupOptions` in `vite` build configuration

astro.config.mjs

@@ -10,7 +10,7 @@ import pagefind from "astro-pagefind";
 import { pluginCodeOutput } from "@fujocoded/expressive-code-output";
 
 export default defineConfig({
-  site: "https://astro-nano-demo.vercel.app",
+  site: "https://tpougy.blog",
   integrations: [
     astroExpressiveCode({
       plugins: [pluginLineNumbers(), pluginCodeOutput()],