Remove outdated links from README and streamline content

Author: sdogruyol

README.md

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 [![CI](https://github.com/kemalcr/kemal-cache/actions/workflows/ci.yml/badge.svg)](https://github.com/kemalcr/kemal-cache/actions/workflows/ci.yml)
 
-[Changelog](CHANGELOG.md) · [License](LICENSE) (MIT)
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 ## Powerful Caching For Kemal Applications
 
 `kemal-cache` is production-oriented response caching middleware for [Kemal](https://kemalcr.com/).