Repo is unmaintained: Better maintained repo

[theoludwig]

As @iFwu said in the top of the README.md file :

⚠️ This repository is no longer actively maintained, since I no longer have a requirement for react and styled-jsx and I am unable to commit time to maintaining it. If you're interested in taking over, please let me know.

Since there is not so much activity since then, I decided to take care of this VS Code extension and will try my best to maintain it, available there: https://github.com/Divlo/vscode-styled-jsx.