setup environment for bioflows docs is out of date

[aguang]

Under setting up the environment for bioflows, the command to load the cbc_conda environment is source /gpfs/runtime/cbc_conda/activate_cbc_conda. However, this gives you the error

-bash: /gpfs/runtime/cbc_conda/activate_cbc_conda: No such file or directory

since it is not the right path. Should change the command to source activate_cbc_conda, or else provide the correct path.