Delete or archive unused repos
Another try 😄 

Delete or archive
- [ ] https://github.com/kaitai-io/ide-devel-kaitai-io.github.io
- [ ] https://github.com/kaitai-io/webide-usercontent.kaitai.io
- [ ] https://github.com/kaitai-io/kaitai_struct_examples
- [ ] https://github.com/kaitai-io/kaitai_struct_typescript_runtime

They don't seem to be used anymore.
