Document "Jank" in relevant location

Source:
- Slides and Video linked on the Meetings page: [https://compiler-research.org/meetings/](https://compiler-research.org/meetings/)

Destination (needs to be decided):
- A new [blog post](https://compiler-research.org/blog/)?
- Create a new page and add a summary to the [Projects page](https://compiler-research.org/projects/)?
- Include in the upcoming "Impact" (#170 ) section?