refactor: rename figlet app to ascii and update all references

app/(app)/ascii/page.tsx

@@ -0,0 +1,13 @@
+import { ASCIIConverter } from '@/components/ascii/ASCIIConverter';
+import { AppPage } from '@/components/layout/AppPage';
+
+export default function ASCIIPage() {
+  return (
+    <AppPage
+      title="ASCII Art Generator"
+      description="ASCII Art Text Generator with 373 Fonts"
+    >
+      <ASCIIConverter />
+    </AppPage>
+  );
+}