Try removing all references to obligatory conda environment

[dirkjanvw]

Description

I'm not familiar myself with Kotlin, but I thought I'd give it a try to see if I can implement my own feature request (#208) :)

Type of change

• CHANGE (fix or feature that would cause existing functionality to not work as expected)
• FEATURE (non-breaking change which adds functionality)
• BUGFIX (non-breaking change which fixes an issue)
• ENHANCEMENT (non-breaking change which improves existing functionality)
• NONE (if none of the other choices apply. Example, tooling, build system, CI, docs, etc.)

Checklist:

• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• I have updated relevant documentation

Changelog entry

Please add a one-line changelog entry below. This will be copied to the changelog file during the release process.

Dependencies may be installed system-wide (on `${PATH}`) instead of having to do this through conda