docs: Remove outdated example

Author: igorlukanin

docs/pages/guides/recipes/analytics/funnels.mdx

@@ -306,21 +306,6 @@ Funnel-based cubes have the following structure:
 - **time** - time dimension for the funnel. Use it to filter your analysis for
   specific dates or to analyze how conversion changes over time.
 
-In the following example, we use the `conversions` measure along with the
-`steps` dimension to display a classic bar chart showing the funnel's steps.
-
-<iframe
-  src="https://codesandbox.io/embed/nw87w1nnjm?fontsize=14"
-  style={{
-    width: "100%",
-    height: 500,
-    border: 0,
-    borderRadius: 4,
-    overflow: "hidden",
-  }}
-  sandbox="allow-modals allow-forms allow-popups allow-scripts allow-same-origin"
-></iframe>
-
 ## Performance considerations
 
 Funnel joins are extremely heavy for most modern databases and complexity grows