drop support for src-relative imports

packages/theme/src/themes.ts

@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-import { createTheme } from 'baseTheme';
+import { createTheme } from './baseTheme';
 import { blue, yellow } from '@material-ui/core/colors';
 
 export const lightTheme = createTheme({

packages/theme/tsconfig.json

@@ -1,7 +1,5 @@
 {
   "extends": "../../tsconfig.json",
   "include": ["src"],
-  "compilerOptions": {
-    "baseUrl": "src"
-  }
+  "compilerOptions": {}
 }