Fix section for upcoming training sessions, it should be empty (for now)
Fix section for upcoming training sessions, it should be empty (for now)

svenlange/coderetreat.github.io,yugangbai/coderetreat.github.io,yugangbai/coderetreat.github.io,coderetreat/coderetreat.github.io,coderetreat/coderetreat.github.io,tpd-opitz/coderetreat.github.io,svenlange/coderetreat.github.io,coderetreat/coderetreat.github.io,tpd-opitz/coderetreat.github.io,coderetreat/coderetreat.github.io,svenlange/coderetreat.github.io,yugangbai/coderetreat.github.io,yugangbai/coderetreat.github.io,tpd-opitz/coderetreat.github.io,svenlange/coderetreat.github.io