remove koko analytics (we don't list wordpress plugins)

- ref. https://github.com/awesome-selfhosted/awesome-selfhosted/issues/3589

README.md

@@ -126,8 +126,7 @@ _Related: [Personal Dashboards](#personal-dashboards)_
 - [Druid](http://druid.io/) - Distributed, column-oriented, real-time analytics data store. ([Source Code](https://github.com/druid-io/druid)) `Apache-2.0` `Java`
 - [EDA](https://eda.jortilles.com/en/jortilles-english/) - Web application for data analysis and visualization. ([Source Code](https://github.com/jortilles/EDA)) `Apache-2.0` `Nodejs`
 - [GoAccess](http://goaccess.io/) - Real-time web log analyzer and interactive viewer that runs in a terminal. ([Source Code](https://github.com/allinurl/goaccess)) `GPL-2.0` `C`
-- [GoatCounter](https://www.goatcounter.com) - Easy web statistics without tracking of personal data; ([Source Code](https://github.com/zgoat/goatcounter)) `EUPL-1.2` `Go`
-- [Koko Analytics](https://www.kokoanalytics.com/) - Privacy-friendly and open source analytics plugin for WordPress. ([Source Code](https://github.com/ibericode/koko-analytics/)) `GPL-3.0` `PHP`
+- [GoatCounter](https://www.goatcounter.com) - Easy web statistics without tracking of personal data. ([Source Code](https://github.com/zgoat/goatcounter)) `EUPL-1.2` `Go`
 - [Metabase](https://metabase.com/) - Metabase is the easy, open source way for everyone in your company to ask questions and learn from data. Simple Dashboarding and GUI Query tool, Nightly Emails and Slack Integration w/ PostgreSQL, MySQL, Redshift and other DBs. ([Source Code](https://github.com/metabase/metabase)) `AGPL-3.0` `Java`
 - [Offen](https://www.offen.dev/) - Offen is a fair and open web analytics tool. Gain insights while your users have full access to their data. Lightweight, self hosted and free. ([Demo](https://www.offen.dev/try-demo/), [Source Code](https://github.com/offen/offen)) `Apache-2.0` `Go/Docker`
 - [Open Web Analytics](http://www.openwebanalytics.com/) - Google Analytics and Matomo alternative. ([Source Code](https://github.com/padams/Open-Web-Analytics)) `GPL-2.0` `PHP`