Update details for Nelkinda Coderetreat.
Update details for Nelkinda Coderetreat.

coderetreat/coderetreat.github.io,svenlange/coderetreat.github.io,coderetreat/coderetreat.github.io,coderetreat/coderetreat.github.io,svenlange/coderetreat.github.io,svenlange/coderetreat.github.io,coderetreat/coderetreat.github.io,svenlange/coderetreat.github.io