Add open graph images and optimize PNG files

- Added /og/default.png (1200x630) for open graph social sharing
- Added /og/twitter.png for Twitter-specific social sharing
- Implemented open graph metadata in layout.tsx with proper OG tags
- Implemented Twitter card metadata with summary_large_image
- Optimized apple-touch-icon.png files across public and docs directories
- Updated homepage headline and subheading copy

Open Graph Features:
- Default OG image for general social sharing (Facebook, LinkedIn, etc)
- Twitter-specific image for better Twitter card display
- Proper meta tags for title, description, URL, site name
- Locale and type specifications for better platform compatibility

This improves social sharing appearance and increases click-through rates
when Lanyards links are shared on social media platforms.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

Author: renderghost

docs/public/apple-touch-icon.png

@@ -26,6 +26,30 @@ export const metadata: Metadata = {
   title: 'Lanyards - Researcher Profiles on AT Protocol',
   description:
     'A dedicated profile for researchers, built on the AT Protocol. An alternative to ORCID.',
+  openGraph: {
+    title: 'Lanyards - Researcher Profiles on AT Protocol',
+    description:
+      'A dedicated profile for researchers, built on the AT Protocol. An alternative to ORCID.',
+    url: 'https://lanyards.app',
+    siteName: 'Lanyards',
+    images: [
+      {
+        url: '/og/default.png',
+        width: 1200,
+        height: 630,
+        alt: 'Lanyards - Researcher Profiles',
+      },
+    ],
+    locale: 'en_US',
+    type: 'website',
+  },
+  twitter: {
+    card: 'summary_large_image',
+    title: 'Lanyards - Researcher Profiles on AT Protocol',
+    description:
+      'A dedicated profile for researchers, built on the AT Protocol. An alternative to ORCID.',
+    images: ['/og/twitter.png'],
+  },
 };
 
 export const viewport: Viewport = {

docs/static/apple-touch-icon.png

@@ -42,16 +42,12 @@ export default function Home() {
 
           {/* Main Heading */}
           <h1 className="text-4xl md:text-5xl lg:text-6xl font-bold text-foreground leading-tight">
-            Your research identity,
-            <br />
-            one link
+            Welcome to Lanyards
           </h1>
 
           {/* Subheading */}
           <p className="text-lg md:text-xl text-muted-foreground max-w-2xl mx-auto leading-relaxed">
-            A single curated link for academic researchers that aggregates your
-            complete scholarly presence—publications, talks, affiliations, and
-            social profiles.
+            The curated link for academic researchers that collects your complete scholarly presence—publications, talks, affiliations, and social profiles.
           </p>
 
           {/* CTA Buttons */}