Note below

• do source bin/activate to activate python3.7 virtual environment before install/update python module upon existing one
• Do changes on dev branch and do mkdocs gh-deploy command ourside of docs-folder to enable so that they can implement .yml configuration file properly
• Then the new branch gh-pages will be made autonomatically, Don't change directly on that branch whenever you supposed to change the doc's content
• Please change on dev branch and do the same procedure from step 2 (delete gh-pages branch if necessary)