Migrate stylelintrc to stylint.config.js

[ChunkyProgrammer]

Migrate stylelintrc to stylint.config.js

Pull Request Type

• [x] Other - maintenance/dev chore

Description

This PR migrates the stylelintrc file to a stylelint.config.mjs file. This is now the recommended format for stylelint. https://stylelint.io/user-guide/configure/

We can and probably should still use the .stylelintignore file. See the note here: https://stylelint.io/user-guide/configure/#ignorefiles

Testing

• make a stylelint "error" in a css and scss file. ex: add a width property instead of inset-size
• run yarn run lint-style and make sure the error shows

Desktop

• OS: Fedora Linux
• OS Version: 41 KDE
• FreeTube version: latest nightly