update image sources to use external URLs and remove unused SVG file

Author: asvegah

app/page.tsx

@@ -6,7 +6,7 @@ export default function Home() {
       <main className="flex flex-col gap-[32px] row-start-2 items-center sm:items-start">
         <Image
           className="dark:invert"
-          src="/simtropolis.svg"
+          src="https://raw.githubusercontent.com/simtropolis/www/refs/heads/main/public/simtropolis.svg"
           alt="Next.js logo"
           width={180}
           height={38}
@@ -56,7 +56,7 @@ export default function Home() {
         >
           <Image
             aria-hidden
-            src="/file.svg"
+            src="https://raw.githubusercontent.com/simtropolis/www/refs/heads/main/public/file.svg"
             alt="File icon"
             width={16}
             height={16}
@@ -71,7 +71,7 @@ export default function Home() {
         >
           <Image
             aria-hidden
-            src="/window.svg"
+            src="https://raw.githubusercontent.com/simtropolis/www/refs/heads/main/public/window.svg"
             alt="Window icon"
             width={16}
             height={16}
@@ -86,7 +86,7 @@ export default function Home() {
         >
           <Image
             aria-hidden
-            src="/globe.svg"
+            src="https://raw.githubusercontent.com/simtropolis/www/refs/heads/main/public/globe.svg"
             alt="Globe icon"
             width={16}
             height={16}