[docs] Fix live edit

[oliviertassinari]

Revert #6681. Same bug as in mui/material-ui#35118 (comment).

HEAD, broken: https://637e2b8be1aade00098a3987--material-ui-x.netlify.app/x/react-data-grid/#DataGridProDemo
PR, works: https://deploy-preview-6975--material-ui-x.netlify.app/x/react-data-grid/#DataGridProDemo

I have no idea what's wrong but it would be great to see if the problem is on our side or Next.js's side

Same bug on the master branch: https://mui.com/x/react-data-grid/.

[mui-bot]

	Messages
📖	Netlify deploy preview: https://deploy-preview-6975--material-ui-x.netlify.app/

These are the results for the performance tests:

Test case	Unit	Min	Max	Median	Mean	σ
Filter 100k rows	ms	679.9	1,187.8	683	867.24	191.746
Sort 100k rows	ms	640.3	1,238.5	1,238.5	982.42	201.635
Select 100k rows	ms	171.5	395.3	284.4	281.62	72.978
Deselect 100k rows	ms	162.4	299.8	200.1	208.48	50.244

Generated by 🚫 dangerJS against 1ab2507

[oliviertassinari]

We will need to figure out what's wrong. This fix is only on the surface, I won't have the time to dive deeper. I have applied the same fix to master.

cc @flaviendelangle in case you are on dependencies update duty later on, Next.js is breaking it.