Fix mapping in exports (#1020)

* Fix mapping in exports

Fixes #1019
- Add correct mapping for public entrypoints.

* Remove shoelace.js from from exports list

Should still works fine while importing this way: import { thing } from '@shoelace-style/shoelace';

package.json

@@ -13,7 +13,12 @@
     ".": {
       "types": "./dist/shoelace.d.ts",
       "import": "./dist/shoelace.js"
-    }
+    },
+    "./themes/*": "./dist/themes/*",
+    "./components/*": "./dist/components/*",
+    "./utilities/*": "./dist/utilities/*",
+    "./react/*": "./dist/react/*",
+    "./translations/*": "./dist/translations/*"
   },
   "files": [
     "dist"