Update README with latest ABOUT.md, INSTALL.md, CONTRIBUTING.md and badges

Author: github-actions[bot]

README.md

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 # CTBase.jl
 
+<!-- 
+For instructions on how to customize this README.template.md and use the centralized workflow,
+please see the user guide: https://github.com/orgs/control-toolbox/discussions/67
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+
 The CTBase.jl package is part of the [control-toolbox ecosystem](https://github.com/control-toolbox).
 
 | **Category** | **Badge** |
@@ -59,10 +64,7 @@ pkg> add CTBase
 If you think you found a bug or if you have a feature request / suggestion, feel free to open an [issue][issue-url].  
 Before opening a pull request, please start an issue or a discussion on the topic. 
 
-Contributions are welcomed, check out [how to contribute to a Github project](https://docs.github.com/en/get-started/exploring-projects-on-github/contributing-to-a-project).  
-If it is your first contribution, you can also check [this first contribution tutorial](https://github.com/firstcontributions/first-contributions).  
-You can find first good issues (if any 🙂) [here][first-good-issue-url].  
-You may find other packages to contribute to at the [control-toolbox organization](https://github.com/control-toolbox).
+Contributions are welcomed, check out [how to contribute to a Github project](https://docs.github.com/en/get-started/exploring-projects-on-github/contributing-to-a-project). If it is your first contribution, you can also check [this first contribution tutorial](https://github.com/firstcontributions/first-contributions). You can find first good issues (if any 🙂) [here][first-good-issue-url]. You may find other packages to contribute to at the [control-toolbox organization](https://github.com/control-toolbox).
 
 If you want to ask a question, feel free to start a discussion [here](https://github.com/orgs/control-toolbox/discussions). This forum is for general discussion about this repository and the [control-toolbox organization](https://github.com/control-toolbox).