Update Netlify Identity Widget warning

Author: kyoshino

src/lib/main.js

@@ -370,13 +370,13 @@ if (scriptElement?.type === 'module') {
   );
 }
 
-const netlifyIdentityScriptElement =
-  'script[src="https://identity.netlify.com/v1/netlify-identity-widget.js"]';
+const netlifyIdentityScriptElement = /** @type {HTMLScriptElement | null} */ (
+  document.querySelector('script[src="https://identity.netlify.com/v1/netlify-identity-widget.js"]')
+);
 
-// Warn if Netlify Identity Widget is included, as it’s not compatible with Sveltia CMS and has been
-// officially deprecated by Netlify.
-if (document.querySelector(netlifyIdentityScriptElement)) {
-  console.warn('Netlify Identity has been deprecated. The widget is not supported in Sveltia CMS.');
+// Warn if Netlify Identity Widget is included, as it’s not compatible with Sveltia CMS.
+if (netlifyIdentityScriptElement) {
+  console.warn('Netlify Identity Widget is not supported in Sveltia CMS.');
 }
 
 // Automatically initialize the CMS if manual initialization is not requested AND the script is NOT