feat(i18n): implement language switching and localization support

- Remove i18next configuration and dependencies
- Add language switcher component
- Integrate language change functionality with cookies
- Update translations for English and Persian
- Modify layout and page components to support dynamic language rendering
- Refactor Tailwind CSS configuration for custom colors

package.json

@@ -9,13 +9,9 @@
     "lint": "next lint"
   },
   "dependencies": {
-    "i18next": "^25.2.1",
-    "i18next-browser-languagedetector": "^8.1.0",
-    "i18next-http-backend": "^3.0.2",
     "next": "15.3.3",
     "react": "^19.0.0",
-    "react-dom": "^19.0.0",
-    "react-i18next": "^15.5.2"
+    "react-dom": "^19.0.0"
   },
   "devDependencies": {
     "@eslint/eslintrc": "^3",