[docs-infra] Re-add fs-extra to fix Netlify deploy

[bernardobelchior]

Fixes failing Netlify deploys. E.g., 1, 2.

This is intended as a quick fix while I'm investigating the root cause.

[mui-bot]

Deploy preview: https://deploy-preview-19176--material-ui-x.netlify.app/

Bundle size report

Bundle	Parsed size	Gzip size
@mui/x-data-grid	0B(0.00%)	0B(0.00%)
@mui/x-data-grid-pro	0B(0.00%)	0B(0.00%)
@mui/x-data-grid-premium	0B(0.00%)	0B(0.00%)
@mui/x-charts	0B(0.00%)	0B(0.00%)
@mui/x-charts-pro	0B(0.00%)	0B(0.00%)
@mui/x-date-pickers	0B(0.00%)	0B(0.00%)
@mui/x-date-pickers-pro	0B(0.00%)	0B(0.00%)
@mui/x-tree-view	0B(0.00%)	0B(0.00%)
@mui/x-tree-view-pro	0B(0.00%)	0B(0.00%)

Details of bundle changes

Generated by 🚫 dangerJS against 1436da6

[Janpot]

Probably relying on a script in monorepo that uses fs-extra. If that case we should consider adding it to dependencies in monorepo rather than devDependencies such that it gets installed correctly. To note that this only applies to the top-level monorepo package. workspaces are not at all considered by pnpm install. This is one of the reasons why we're moving away from the github dependency.

Also opening mui/mui-public#498

[bernardobelchior]

Probably relying on a script in monorepo that uses fs-extra. If that case we should consider adding it to dependencies in monorepo rather than devDependencies such that it gets installed correctly. To note that this only applies to the top-level monorepo package. workspaces are not at all considered by pnpm install. This is one of the reasons why we're moving away from the github dependency.

Also opening mui/mui-public#498

Yeah, that's the issue. It is a dependency of netlify-plugin-cache-docs, but only a dev dependency of @mui/monorepo.

I'll see if it's easy to remove fs-extra from @mui/monorepo or add it as a dependency otherwise.