feat(docs): enhance documentation and UI consistency

- Updated the index.html to dynamically set the theme color based on user selection, improving user experience during theme switching.
- Modified proxy.ts to include 'icon.png' in the matcher for better asset handling.
- Added a new icon.png file for enhanced branding.
- Improved metadata in layout.tsx and page.tsx files for better clarity and consistency in documentation.
- Updated various documentation files to reflect the new branding of 'Cursor Byok' and ensure consistent terminology throughout.
- Removed outdated blog entries and added new content to better align with the current product direction.

apps/docs/lib/layout.shared.tsx

@@ -1,3 +1,4 @@
+import Image from 'next/image';
 import { zhCN } from '@fumadocs/language/zh-cn';
 import type { BaseLayoutProps } from 'fumadocs-ui/layouts/shared';
 import { uiTranslations } from 'fumadocs-ui/i18n';
@@ -13,11 +14,16 @@ const navLabels: Record<Language, { docs: string; blog: string; download: string
 
 export function baseOptions(lang: Language): BaseLayoutProps {
   const labels = navLabels[lang];
-  const prefix = lang === i18n.defaultLanguage ? '' : `/${lang}`;
+  const prefix = `/${lang}`;
 
   return {
     nav: {
-      title: appName,
+      title: (
+        <>
+          <Image src="/images/logo.png" alt="" width={20} height={20} className="rounded-[5px]" />
+          {appName}
+        </>
+      ),
     },
     links: [
       {