chore: install cssbundling rails and set up compilation

spec/dummy/node_modules/unicorn-magic/readme.md

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+# unicorn-magic
+
+> Some useful utilities I often need
+
+*I'm not accepting requests.*
+
+## Install
+
+```sh
+npm install unicorn-magic
+```
+
+## Usage
+
+```js
+import {delay} from 'unicorn-magic';
+
+await delay({seconds: 1});
+
+console.log('1 second later');
+```
+
+## API
+
+See [the types](index.d.ts).