[code-infra] Remove nested imports from theme augmentation

[Janpot]

Fix type errors in X docs. Deeply nested paths are not allowed. not to import, and not to declare module.

[mui-bot]

Netlify deploy preview

• docs/data/material/migration/upgrade-to-v7/upgrade-to-v7.md

@material-ui/core: parsed: +Infinity% , gzip: +Infinity%
@mui/joy: parsed: +Infinity% , gzip: +Infinity%
@mui/joy/Autocomplete: parsed: +Infinity% , gzip: +Infinity%
Autocomplete: parsed: +Infinity% , gzip: +Infinity%
@material-ui/lab: parsed: +Infinity% , gzip: +Infinity%
TextField: parsed: +Infinity% , gzip: +Infinity%
@material-ui/unstyled: parsed: +Infinity% , gzip: +Infinity%
SpeedDialAction: parsed: +Infinity% , gzip: +Infinity%
@mui/joy/Select: parsed: +Infinity% , gzip: +Infinity%
@mui/joy/Menu: parsed: +Infinity% , gzip: +Infinity%
Tooltip: parsed: +Infinity% , gzip: +Infinity%
SwipeableDrawer: parsed: +Infinity% , gzip: +Infinity%
Alert: parsed: +Infinity% , gzip: +Infinity%
TabList: parsed: +Infinity% , gzip: +Infinity%
SpeedDial: parsed: +Infinity% , gzip: +Infinity%
Pagination: parsed: +Infinity% , gzip: +Infinity%
Drawer: parsed: +Infinity% , gzip: +Infinity%
Popover: parsed: +Infinity% , gzip: +Infinity%
LoadingButton: parsed: +Infinity% , gzip: +Infinity%
Dialog: parsed: +Infinity% , gzip: +Infinity%
and 269 more changes

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[Hanymato]

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