Modify basic settings, i18n, add docs

- Edit README for subspecific rules
- Add meetup-2-guide for both root and en
- Remove vscode folder
- Remove default pages and docs
- Gitignore add editor section
- Setup i18n

Signed-off-by: Asai Neko <sugar@sne.moe>

package.json

@@ -10,9 +10,11 @@
     "astro": "astro"
   },
   "dependencies": {
+    "@astrojs/mdx": "^4.3.12",
     "@astrojs/starlight": "^0.37.0",
     "astro": "^5.6.1",
-    "sharp": "^0.34.2"
+    "sharp": "^0.34.2",
+    "starlight-theme-galaxy": "^0.5.2"
   },
   "packageManager": "yarn@4.12.0"
 }