Authentication for GUI/ User accounts/ Admin user management panels

Please see following issues for the completed tasks within this merge:

#326 (closed) #314 (closed) #332 (closed)

Note: Before starting GUI, please clean your Fed-BioMed env. and update fedbiomed-gui conda environment.

Start GUI on debug mod: ./scripts/fedbiomed_run gui start
connect through localhost:8484

or

Review on debug/development mode

Start GUI on debug mod: ./scripts/fedbiomed_run gui --debug start
Start React:

cd ./gui/ui
# make sure node_modules are installed. Otherwise please run yarn install
yarn start

connect through localhost:3000

For first login credentials please checkout ./gui/config_gui.ini file.