fix: set CSP `frame-src` to `'none'`
diff --git a/src/editor/sandbox/index.js b/src/editor/sandbox/index.js
index 1574953..b237a60 100644
--- a/src/editor/sandbox/index.js
+++ b/src/editor/sandbox/index.js
@@ -68,7 +68,7 @@
         'npm.elemecdn.com'
       ].map((domain) => 'https://' + domain)
     ),
-    'frame-src': [`'self'`, 'https://*.apache.org'],
+    'frame-src': [`'none'`],
     'object-src': [`'none'`],
     'navigate-to': [`'none'`],
     'worker-src': [`'none'`]