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- Removed outdated blog entries and added new content to better align with the current product direction.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/source.ts

@@ -26,9 +26,9 @@ export const source = loader({
   i18n,
 });
 
-/** Locale URL prefix segment; empty for the default (hidden) locale. */
+/** Locale URL prefix segment; all locales are explicit (hideLocale: 'never'). */
 function localeSegment(page: (typeof source)['$inferPage']): string | undefined {
-  return page.locale === i18n.defaultLanguage ? undefined : page.locale;
+  return page.locale;
 }
 
 export function getPageImageUrl(page: (typeof source)['$inferPage']) {