feat: update website branding with new logo and wordmark, enhance styles for better responsiveness

webapp/src/components/AppAuthenticatedShell.tsx

@@ -33,7 +33,7 @@ export default function AppAuthenticatedShell(props: AppAuthenticatedShellProps)
         <header className="topbar">
           <div className="brand">
             <img src="/logo-64.png" alt="NodeWarden logo" className="brand-logo" />
-            <span className="brand-name">NodeWarden</span>
+            <img src="/nodewarden-wordmark.svg" alt="NodeWarden" className="brand-wordmark" />
             <span className="mobile-page-title">{props.currentPageTitle}</span>
           </div>
           <div className="topbar-actions">