It appears that the repository has undergone several changes and renamings:

backend/node_modules/postcss-selector-parser/README.md

@@ -1,49 +0,0 @@
-# postcss-selector-parser [![test](https://github.com/postcss/postcss-selector-parser/actions/workflows/test.yml/badge.svg)](https://github.com/postcss/postcss-selector-parser/actions/workflows/test.yml)
-
-> Selector parser with built in methods for working with selector strings.
-
-## Install
-
-With [npm](https://npmjs.com/package/postcss-selector-parser) do:
-
-```
-npm install postcss-selector-parser
-```
-
-## Quick Start
-
-```js
-const parser = require('postcss-selector-parser');
-const transform = selectors => {
-    selectors.walk(selector => {
-        // do something with the selector
-        console.log(String(selector))
-    });
-};
-
-const transformed = parser(transform).processSync('h1, h2, h3');
-```
-
-To normalize selector whitespace:
-
-```js
-const parser = require('postcss-selector-parser');
-const normalized = parser().processSync('h1, h2, h3', {lossless: false});
-// -> h1,h2,h3
-```
-
-Async support is provided through `parser.process` and will resolve a Promise
-with the resulting selector string.
-
-## API
-
-Please see [API.md](API.md).
-
-## Credits
-
-* Huge thanks to Andrey Sitnik (@ai) for work on PostCSS which helped
-  accelerate this module's development.
-
-## License
-
-MIT