Feature/add title for accessibility

[rkristelijn]

• I've read and followed the contributing guide on how to create great pull requests.
• I've updated the relevant documentation for any new or updated feature.
• I've linked relevant GitHub issue with "Closes When generating a new app it starts off with accessibility issues because of lacking title #4760 .
• I've added a visual demonstration in the form of a screenshot or video.

[bharatkashyap]

Thanks @rkristelijn! We need to update the https://github.com/mui/toolpad/blob/master/packages/create-toolpad-app/src/templates/nextjs/nextjs-app/rootLayout.ts and https://github.com/mui/toolpad/blob/master/packages/create-toolpad-app/src/templates/nextjs/nextjs-pages/document.ts to update the apps generated when using create-toolpad-app to bootstrap Toolpad Core apps

[rkristelijn]

hi @bharatkashyap I've updated the code per suggestion