feat(prettier): support astro and mdx formatting

- Added prettier-plugin-astro as dev dependency
- Config prettier to explicitly use mdx parser when formatting mdx files

Signed-off-by: Noa Virellia <noa@requiem.garden>

package.json

@@ -15,5 +15,9 @@
         "astro": "^5.6.1",
         "sharp": "^0.34.2"
     },
+    "devDependencies": {
+        "prettier": "^3.7.4",
+        "prettier-plugin-astro": "^0.14.1"
+    },
     "packageManager": "pnpm@10.25.0+sha512.5e82639027af37cf832061bcc6d639c219634488e0f2baebe785028a793de7b525ffcd3f7ff574f5e9860654e098fe852ba8ac5dd5cefe1767d23a020a92f501"
-}
+}