Forum spam and migration

We unfortunately suffered a spam bot attack and this meant that there was a period of a number of hours where registration was disabled. Following which we also set the site to read-only, while we migrated to a shiny new instance, hosted by the creators of the Discord software.

Everything should be more or less back to normal now, with the exception of icons in the global navigation header not loading, which we are look into. Should you spot anything else please let me know!