Updated developer_setup.md readme 
Updated developer_setup.md readme 

Added languages necessary to install for the executor. Also added instructions for updating nodejs to build the frontend.
BenDoan/code_court,unoacm/code_court,unoacm/code_court,unoacm/code_court,BenDoan/code_court,unoacm/code_court,BenDoan/code_court,BenDoan/code_court