theme: rename compat -> unified

Signed-off-by: Patrik Oldsberg <poldsberg@gmail.com>

packages/theme/src/index.ts

@@ -20,7 +20,7 @@
  * @packageDocumentation
  */
 
-export * from './compat';
+export * from './unified';
 export * from './base';
 export * from './v4';
 export * from './v5';

packages/theme/src/v4/baseTheme.ts

@@ -21,7 +21,7 @@ import { Overrides } from '@material-ui/core/styles/overrides';
 import { SimpleThemeOptions } from './types';
 import { createBaseThemeOptions } from '../base';
 import { defaultComponentThemes } from '../v5';
-import { transformV5ComponentThemesToV4 } from '../compat/overrides';
+import { transformV5ComponentThemesToV4 } from '../unified/overrides';
 
 /**
  * An old helper for creating MUI v4 theme options.