Add new host: self-organized
Add new host: self-organized

And migrate at least some workshops to that administrator.

wking/swc-amy,wking/swc-amy,swcarpentry/amy,vahtras/amy,swcarpentry/amy,pbanaszkiewicz/amy,swcarpentry/amy,vahtras/amy,pbanaszkiewicz/amy,pbanaszkiewicz/amy,wking/swc-amy,wking/swc-amy,vahtras/amy