docs: create README and update project configuration

- Add comprehensive README with project overview, features, and roadmap
- Update VSCode settings with new dictionary words
- Modify language switcher, mobile header, and theme toggle components
- Adjust layout and global styles
- Add language attribute to markdown example post

package.json

@@ -47,13 +47,13 @@
     "@antfu/eslint-config": "^4.3.0",
     "@types/markdown-it": "^14.1.2",
     "@types/mdast": "^4.0.4",
-    "@types/node": "^22.13.4",
+    "@types/node": "^22.13.5",
     "@types/sanitize-html": "^2.13.0",
     "@unocss/eslint-plugin": "^66.0.0",
     "@unocss/preset-attributify": "^66.0.0",
     "@unocss/reset": "^66.0.0",
     "astro-eslint-parser": "^1.2.1",
-    "eslint": "^9.20.1",
+    "eslint": "^9.21.0",
     "eslint-plugin-astro": "^1.3.1",
     "lint-staged": "^15.4.3",
     "mdast-util-to-string": "^4.0.0",