Update email client to yagmail

Update email client to yagmail

Update TechdocsAPI/backend/services/auth/ops.py

Update TechdocsAPI/backend/services/auth/ops.py

Update TechdocsAPI/backend/__init__.py

Update TechdocsAPI/backend/__init__.py

Update TechdocsAPI/backend/__init__.py

Update TechdocsAPI/backend/__init__.py

Update TechdocsAPI/backend/__init__.py

Update TechdocsAPI/backend/__init__.py

Update verification domain

Add email verification on singup

Mark singleton connection class not singleton for testing SQL serevr's timeout period

CLI tool

Delete TechdocsAPI/.gitattributes

Update router.py

Add packaging setup

update docker file (#15)

CMD tool ready

cmd tool dev (#10)

Initial cmd tool script

Separated the backend and frontend