[RFC] Restructure folder structure

[mnajdova]

Now that we renamed the packages, it is probably a good idea to rename the folders we have for each mackage. Currently, the packages are prefixed with "material-ui" and have the old package name. I propose to rename them to: "mui-[package-name]". This is what the updated names would be:

material-ui -> mui-material
material-ui-benchmark -> mui-benchmark
material-ui-codemod -> mui-codemod
material-ui-docs -> mui-docs
material-ui-envinfo -> mui-envinfo
material-ui-icons -> mui-icons-material
material-ui-lab -> mui-lab
material-ui-private-theming -> mui-private-theming
material-ui-styled-engine -> mui-styled-engine
material-ui-styled-engine-sc -> mui-styled-engine-sc
material-ui-styles -> mui-styles
material-ui-system ->mui-system
material-ui-types -> mui-types
material-ui-unstyled -> mui-core
material-ui-utils -> mui-utils
netlify-plugin-cache-docs // no change
typescript-to-proptypes // no change

I am opening the issue so that we can align on the names before I do the change that will basically affect the whole project.

This is not a public change, and we can do it whenever we think it's the right time.

[eps1lon]

Yep, I think we always wanted to rename the folders anyway for better DX (who wants to type material-ui- all the time?).

Note that we we rely on the naming of the folders in some places. For example, ApiPage is already broken since it assumes material-ui maps to @mui/core and material-ui-unstyled maps to @mui/unstyled: https://github.com/eps1lon/material-ui/blob/4014fb8ade6195edd6921b6357529537458d70d1/docs/src/modules/components/ApiPage.js#L210

There are probably other places as well that assume that folder names map to package names.

[mnajdova]

Didn't noticed the issue. Alright, going to do the change today.