Revert "Merge branch 'C3_marwa-mehanna_#218_competition_crud' into C2_abuali_#240_competitions"

This reverts commit 0ed0de26a2bd53343db265a52e3bc75766d3e83c, reversing
changes made to 209516296c863c94e12fafae8ba7dce4def1faba.