Clarify instructions for participation

Author: jotaen

README.md

@@ -12,26 +12,26 @@ klog is a plain-text file format and a command line tool for time tracking.
 
 📥 [Install](https://klog.jotaen.net#get-klog) – Get the latest version
 
-📢 [Changelog](https://github.com/jotaen/klog/blob/main/CHANGELOG.md) – See what’s new
+📢 [Changelog](CHANGELOG.md) – See what’s new
+
+💬 [Discussions](https://github.com/jotaen/klog/discussions) – Ask questions and share feedback
 
 💡 [Specification](Specification.md) – Study the file format
 
-## Contribute
+## Participate
 
-If you have questions, feature ideas, or just want to bounce off some feedback,
+If you have questions, feedback, feature ideas, or want to report something that’s not working properly,
 feel invited to [start a discussion](https://github.com/jotaen/klog/discussions).
-In case you run into a bug, please [file an issue](https://github.com/jotaen/klog/issues).
-(When in doubt, just go for an issue.)
 
-This repository contains the sources of the klog command line tool as well as
-the [specification document](Specification.md) of the klog file format.
-Note that both are technically independent of each other, which implies that
-they also have different version numbers.
+If you’d like to contribute code, please discuss your intended change beforehand. Please refrain from submitting unsolicited pull requests.
 
 ## About
 
 klog was created by [Jan Heuermann](https://www.jotaen.net).
+
 You are free to use it under the following terms:
 
 - Command line tool: [MIT license](LICENSE.txt)
 - File specification: [public domain (CC0/OWFa)](Specification.md#License)
+
+Note that the command line tool and the file format specification have independent version numbering schemes.