Update logo from png to svg

lightrag_webui/src/features/LoginPage.tsx

@@ -153,7 +153,7 @@ const LoginPage = () => {
         <CardHeader className="flex items-center justify-center space-y-2 pb-8 pt-6">
           <div className="flex flex-col items-center space-y-4">
             <div className="flex items-center gap-3">
-              <img src="logo.png" alt="LightRAG Logo" className="h-12 w-12" />
+              <img src="logo.svg" alt="LightRAG Logo" className="h-12 w-12" />
               <ZapIcon className="size-10 text-emerald-400" aria-hidden="true" />
             </div>
             <div className="text-center space-y-2">

lightrag_webui/src/features/SiteHeader.tsx

@@ -71,7 +71,6 @@ export default function SiteHeader() {
       <div className="min-w-[200px] w-auto flex items-center">
         <a href={webuiPrefix} className="flex items-center gap-2">
           <ZapIcon className="size-4 text-emerald-400" aria-hidden="true" />
-          {/* <img src='/logo.png' className="size-4" /> */}
           <span className="font-bold md:inline-block">{SiteInfo.name}</span>
         </a>
         {webuiTitle && (