Our wiki has just received a maintenance update (from an unsupported version to a LTS release which is supported until mid-2019). As a result the skin “Dark vector” was removed as it is no longer supported – I don’t know if anybody used it.
Wiki registration is also fixed and working again.
If you encounter any issues please post in this thread.
Update 20.12. 20:00 CET: File upload is fixed now too. Damn you Alpine Linux for your minimalist packages!