Website (2021 remake) is currently built on a popular and relatively light GeneratePress base theme (GPLv3) using the "Cloud" site template from it's site library. Paid premium update license has been provided by Netura.
For more background on the site technology during big revamp in 2021 refer to blog post and linked with video demo https://jyväskylä.hacklab.fi/2021/12/10/virtuaalinen-yhteisomiitti-2021/.
This repository is mostly empty because the layout is produced by a wysiwyg "site builder" storing it's configuration to database in traditional "CMS" way of doing HTML easily. This is not very GIT or developer friendly way which is praicing for configuration-as-code methodology and tools like templating engines, ORM's or MVC-architecture that picked up steam in the web only after WordPress was made.
A GIT/developer friendly layout framework https://timber.github.io/docs/v2/ is currently being considered, which gives more developer oriented workflow for PHP web development involving WordPress as the backend.
Issue tracker linked to this repository is loosely up to date and does not take into account latest technology reconsiderations and some older tasks may become irrelevant.
There is also a old issue tracker online as this repository was made by accident as new during previous WP technology upgrade efforts.
Vagrant development environment with live site sync script and some documentation is provided at https://github.com/HacklabJKL/VVV.