OpenBSD home lab almost back on track

- amd64: 5900X / 48 GB / Radeon 6900 XT => need a new keyboard
- riscv64: HiFive Unmatched => needs an SSD + fan replacement
- arm64: Mac mini M2 Pro / 16 GB => needs installation

Next steps:

- finishing a small "central scrutinizer" for the Mac (haven't done electronics in a while)
- figure out how to install OpenBSD on the Mac mini (:
- replace the fan on the Unmatched, add SSD, install
- order a new keyboard