docs: update contributing guidelines (#125)

* docs: update contributing guidelines

* lint

CONTRIBUTING.md

@@ -1,28 +1,33 @@
 ## How to contribute
 
-Thank you for considering contributing to coURLan!
 
-Here are some important resources:
+If you value this software or depend on it for your product,
+consider sponsoring it and contributing to its codebase.
+Your support will help ensure the sustainability and growth of the project.
 
-  * [List of currently open issues](https://github.com/adbar/courlan/issues) (no pretention to exhaustivity!)
-  * [How to Contribute to Open Source](https://opensource.guide/how-to-contribute/)
+There are many ways to contribute:
 
-There are many ways to contribute, you could:
+  * Sponsor the project: Show your appreciation [on GitHub](https://github.com/sponsors/adbar) or [ko-fi.com](https://ko-fi.com/adbarbaresi).
+  * Find bugs and submit bug reports: Help making Courlan an even more robust tool.
+  * Write code: Fix bugs or add new features by writing [pull requests](https://docs.github.com/en/pull-requests) with a list of what you have done.
 
-  * Improve the documentation
-  * Find bugs and submit bug reports
-  * Submit feature requests
-  * Write tutorials or blog posts
-  * Write code
 
-## Submitting changes
+A special thanks to the [contributors](https://github.com/adbar/courlan/graphs/contributors) who have played a part in Courlan.
 
-Please send a [GitHub Pull Request to coURLan](https://github.com/adbar/courlan/pull/new/master) with a clear list of what you've done (read more about [pull requests](http://help.github.com/pull-requests/)).
 
-**Working on your first Pull Request?** See this tutorial: [How To Create a Pull Request on GitHub](https://www.digitalocean.com/community/tutorials/how-to-create-a-pull-request-on-github)
+## Testing and evaluating the code
 
-For further questions you can contact me by way of [GitHub issues](https://github.com/adbar/courlan/issues), [Twitter](https://twitter.com/adbarbaresi) or [E-Mail](https://adrien.barbaresi.eu/).
+Here is how you can run the tests and code quality checks. Pull requests will only be accepted if the changes are tested and if they there are no errors.
+
+1. Install the necessary packages with `pip install courlan[dev]`
+2. Run the tests and code quality tools:
+   - Tests with `pytest`
+   - Type checking with `mypy` on the directory: `mypy courlan/`
+   - Code formatting with `black` on the directory as well
+
+
+For further questions you can use [GitHub issues](https://github.com/adbar/courlan/issues) or [E-Mail](https://adrien.barbaresi.eu/).
 
 Thanks,
 
-Adrien
+Adrien

README.md

@@ -411,32 +411,25 @@ Details of strict URL filtering can be reviewed and changed in the file
 locally](https://packaging.python.org/tutorials/installing-packages/#installing-from-a-local-src-tree).
 
 
-## Contributing
-
-[Contributions](https://github.com/adbar/courlan/blob/master/CONTRIBUTING.md)
-are welcome!
-
-Feel free to file issues on the [dedicated
-page](https://github.com/adbar/courlan/issues).
-
-
 ## Author
 
-Developed with practical applications of academic research in mind, this software
-is part of a broader effort to derive information from web documents.
-Extracting and pre-processing web texts to the exacting standards of
-scientific research presents a substantial challenge.
-This software package simplifies text data collection and enhances corpus quality,
-it is currently used to build [text databases for research](https://www.dwds.de/d/k-web).
+Initially launched to create text databases for research purposes
+at the Berlin-Brandenburg Academy of Sciences (DWDS and ZDL units),
+this package continues to be maintained but its future development
+depends on community support.
 
-- Barbaresi, A. "[Trafilatura: A Web Scraping Library and
-  Command-Line Tool for Text Discovery and
-  Extraction](https://aclanthology.org/2021.acl-demo.15/)."
-  *Proceedings of ACL/IJCNLP 2021: System Demonstrations*, 2021, pp. 122-131.
+**If you value this software or depend on it for your product, consider
+sponsoring it and contributing to its codebase**. Your support
+[on GitHub](https://github.com/sponsors/adbar) or [ko-fi.com](https://ko-fi.com/adbarbaresi)
+will help maintain and enhance this package.
+Visit the [Contributing page](https://github.com/adbar/courlan/blob/master/CONTRIBUTING.md)
+for more information.
 
-Contact: see [homepage](https://adrien.barbaresi.eu/).
+Reach out via the software repository or the [contact
+page](https://adrien.barbaresi.eu/) for inquiries, collaborations, or
+feedback.
 
-Software ecosystem: see [this
+For more on Courlan's' software ecosystem see [this
 graphic](https://github.com/adbar/trafilatura/blob/master/docs/software-ecosystem.png).