Migrating Default Branch

[king-11]

This issue is similar to one created in IIT-BHU-InstiApp/IIT-BHU-app#297

This issue would require making changes to the CI and CD pipeline to ensure that none of them breaks. Initially, we can have two branches where both will have CI and CD checks and finally when everything checks we can change the default to main from the master. Addition to that we would require changing default on Heroku which can be done at a later stage after contacting the maintainers