Update iframe.mdx

Author: dstala

content/docs/dashboards/widgets/iframe.mdx

@@ -20,6 +20,42 @@ You can pass query parameters to control the embedded page. For example:
 https://app.nocodb.com/sharedViewID?disableTopbar=true&disableToolbar=false
 ```
 
+## Supported Whitelisted Domains
+The following domains other than NocoDB are supported for embedding:
+
+- Airtable
+- Canva
+- ClickUp
+- CodePen
+- DBdiagram
+- Diagrams.net
+- Descript
+- Dropbox
+- Figma
+- Framer
+- GitHub Gist
+- GitLab Snippet
+- Gliffy
+- Google (Maps, Drawings, Drive, Docs, Sheets, Slides, Calendar, Forms, Looker Studio)
+- Grist
+- Instagram
+- Loom
+- Lucidchart
+- Marvel
+- MindMeister
+- Miro
+- Prezi
+- Scribe
+- Spotify
+- Tldraw
+- Trello
+- Typeform
+- Valtown
+- Vimeo
+- Pinterest
+- Whimsical
+- YouTube
+
 ## Use Cases
 
 - Embedding analytics dashboards (e.g., Metabase, Grafana, Superset).