chore: remove ignored files from tracking

frontend/node_modules/postcss/README.md

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-# PostCSS
-
-<img align="right" width="95" height="95"
-     alt="Philosopher’s stone, logo of PostCSS"
-     src="https://postcss.org/logo.svg">
-
-PostCSS is a tool for transforming styles with JS plugins.
-These plugins can lint your CSS, support variables and mixins,
-transpile future CSS syntax, inline images, and more.
-
-PostCSS is used by industry leaders including Wikipedia, Twitter, Alibaba,
-and JetBrains. The [Autoprefixer] and [Stylelint] PostCSS plugins are some of the most popular CSS tools.
-
----
-
-<img src="https://cdn.evilmartians.com/badges/logo-no-label.svg" alt="" width="22" height="16" />  Built by
- <b><a href="https://evilmartians.com/devtools?utm_source=postcss&utm_campaign=devtools-button&utm_medium=github">Evil Martians</a></b>, go-to agency for <b>developer tools</b>.
-
----
-
-[Abstract Syntax Tree]: https://en.wikipedia.org/wiki/Abstract_syntax_tree
-[Evil Martians]:        https://evilmartians.com/?utm_source=postcss
-[Autoprefixer]:         https://github.com/postcss/autoprefixer
-[Stylelint]:            https://stylelint.io/
-[plugins]:              https://github.com/postcss/postcss#plugins
-
-
-## Docs
-Read full docs **[here](https://postcss.org/)**.