feat: Add slogan and update logos to official design

- Add slogan 'Write once. Deploy Everywhere.' to site description
- Update logo references from SVG to PNG (official design)
- Replace favicon with optimized 32x32 PNG
- Update homepage hero image (index.mdx)
- Update Astro config with PNG logo path

All logos now consistent with main repo design ✅

Author: rz1989s

astro.config.mjs

@@ -9,9 +9,9 @@ export default defineConfig({
 	integrations: [
 		starlight({
 			title: 'LUMOS',
-			description: 'Type-safe schema language for Solana development',
+			description: 'Write once. Deploy Everywhere. Type-safe schema language for Solana development.',
 			logo: {
-				src: './src/assets/logo.svg',
+				src: './src/assets/logo.png',
 			},
 			components: {
 				Footer: './src/components/Footer.astro',

public/favicon.png

@@ -1,8 +1,10 @@
 ---
 title: Introduction
-description: Learn what LUMOS is and why it's the best tool for Solana development
+description: Write once. Deploy Everywhere. Type-safe schema language for Solana development.
 ---
 
+> **Write once. Deploy Everywhere.**
+
 ## What is LUMOS?
 
 LUMOS is a **type-safe schema language** designed specifically for Solana development. It bridges the gap between Rust (on-chain programs) and TypeScript (frontend applications) by providing a single source of truth for your data structures.

public/favicon.svg

@@ -5,7 +5,7 @@ template: splash
 hero:
   tagline: Illuminate your Solana development with type-safe cross-language code generation
   image:
-    file: ../../assets/logo.svg
+    file: ../../assets/logo.png
   actions:
     - text: Get Started
       link: /getting-started/installation/