docs(website): use favicon as header icon

docs/.vitepress/config.ts

@@ -28,10 +28,7 @@ export default defineConfig({
   },
 
   themeConfig: {
-    logo: {
-      dark: '/logo-nav-dark.svg',
-      light: '/logo-nav-light.svg',
-    },
+    logo: '/favicon.svg',
 
     nav: [
       {

docs/index.md

@@ -6,8 +6,8 @@ hero:
   text: Token-Oriented Object Notation
   tagline: A compact, human-readable encoding of the JSON data model for LLM prompts.
   image:
-    dark: /logo-nav-dark.svg
-    light: /logo-nav-light.svg
+    dark: /logo-index-dark.svg
+    light: /logo-index-light.svg
     alt: TOON Logo
   actions:
     - theme: brand