Replace how to for code contribution by link (#523)

en/contributing/README.md

@@ -2,13 +2,11 @@
 
 We are really happy that you are interested in contributing to JabRef. Please take your time to look around here. We especially invite you to look into our [community members page](https://discourse.jabref.org/t/community-members/1868?u=koppor) where members introduce themselves.
 
-{% tabs %}
-{% tab title="I am not a programmer" %}
 **I would like to improve the help page. What are the steps?** [![Join the chat at https://gitter.im/JabRef/jabref](https://badges.gitter.im/Join%20Chat.svg)](https://gitter.im/JabRef/jabref)
 
 Please use the "Edit on GitHub" link in the upper right corner. Then, follow [GitHub's guide to edit files in other user's repository](https://docs.github.com/en/repositories/working-with-files/managing-files/editing-files#editing-files-in-another-users-repository).
 
-**I would like to help translating JabRef to another language. How do I get started?** [![Join the chat at https://gitter.im/JabRef/jabref](https://badges.gitter.im/Join%20Chat.svg)](https://gitter.im/JabRef/jabref)
+**I would like to help to translate JabRef to another language. How do I get started?** [![Join the chat at https://gitter.im/JabRef/jabref](https://badges.gitter.im/Join%20Chat.svg)](https://gitter.im/JabRef/jabref)
 
 We encourage you to read about [translating the JabRef user interface](how-to-translate-the-ui.md).
 
@@ -39,48 +37,11 @@ If there is no page for your own language, you can easily create one.
 
 **Can I make a donation? How?**
 
-Donations keep us going! You can use Paypal, Flattr, or bank transfers. Your institution/company can contribute too, through bank transfer for example. All details are provided at [https://donations.jabref.org](https://donations.jabref.org).
+Donations keep us going! You can use PayPal or bank transfers. Your institution/company can contribute too, through bank transfer for example. All details are provided at [https://donations.jabref.org](https://donations.jabref.org).
 
 Our team consists of volunteers. To provide better support, we are currently trying to get a funded developer on board. Please consider donating money!
 {% endtab %}
 
-{% tab title="I am a programmer" %}
-**I am a student and I want to start with something easy** [![Join the chat at https://gitter.im/JabRef/jabref](https://badges.gitter.im/Join%20Chat.svg)](https://gitter.im/JabRef/jabref).
+**I would like to contribute code. How to?**
 
-We collect good issues to start with at our [list of good first issues](https://github.com/orgs/JabRef/projects/5/views/1).
-After finding something, please check our [CONTRIBUTING.md](https://github.com/JabRef/jabref/blob/main/CONTRIBUTING.md).
-
-
-**I am a student and I want to choose from a curated list of university projects** [![Join the chat at https://gitter.im/JabRef/jabref](https://badges.gitter.im/Join%20Chat.svg)](https://gitter.im/JabRef/jabref)
-
-Have a look at [JabRefs candidates for university projects](https://github.com/orgs/JabRef/projects/3). There, a list of possible projects to work on during a teaching period is offered. After finding something, please check our [CONTRIBUTING.md](https://github.com/JabRef/jabref/blob/main/CONTRIBUTING.md).
-
-
-**I am new to open source and want something easy** [![Join the chat at https://gitter.im/JabRef/jabref](https://badges.gitter.im/Join%20Chat.svg)](https://gitter.im/JabRef/jabref)
-
-We collect good issues to start with at our [list of good first issues](https://github.com/orgs/JabRef/projects/5/views/1). After finding something, please check our [CONTRIBUTING.md](https://github.com/JabRef/jabref/blob/main/CONTRIBUTING.md).
-
-
-**I want something with huge impact** [![Discourse](https://img.shields.io/badge/discourse-online-green.svg)](https://discourse.jabref.org/c/features/6)
-
-Look at the discussions in our forum about [new features](https://discourse.jabref.org/c/features/6). Find an interesting topic, discuss it and start contributing. Alternatively, you can check out [JabRefs projects page at GitHub](https://github.com/JabRef/jabref/projects?query=is%3Aopen). Although, of course, you can choose to work on ANY issue, choosing from the projects page has the advantage that these issues have already been categorized, sorted and screened by JabRef maintainers. A typical sub-classifications scheme is "priority" (high, normal and low). Fixing high priority issues is preferred.
-
-
-**I am a lecturer** If you ask yourself how to integrate JabRef into your class, please read the [documentation about how to integrate JabRef into a class of software engineering training](https://devdocs.jabref.org/teaching.html#jabref-and-software-engineering-training). As student, you may notify your lecturer about this possibility.
-
-
-**I want to know how to contribute code and set up my workspace** [![Join the chat at https://gitter.im/JabRef/jabref](https://badges.gitter.im/Join%20Chat.svg)](https://gitter.im/JabRef/jabref)
-
-Check out the [documentation for developers](https://devdocs.jabref.org/contributing.html#contribute-code)
-
-
-**I need help with the code** [![Join the chat at https://gitter.im/JabRef/jabref](https://badges.gitter.im/Join%20Chat.svg)](https://gitter.im/JabRef/jabref)
-
-You can talk to the core developers of JabRef in the [gitter chat](https://gitter.im/JabRef/jabref).
-
-
-**I want to learn about code quality** [![Join the chat at https://gitter.im/JabRef/jabref](https://badges.gitter.im/Join%20Chat.svg)](https://gitter.im/JabRef/jabref)
-
-Please head to [devdocs about code-quality](https://devdocs.jabref.org/code-howtos/code-quality.html#code-quality) to learn about our current efforts to measure and improve code quality.
-{% endtab %}
-{% endtabs %}
+Please head to our [Contributing Guide](https://github.com/JabRef/jabref/blob/main/CONTRIBUTING.md#contributing).