Add js doc comments (#43)

* Add comments for auth and browser package

* DocUpdate user.controller.spec.ts

* DocUpdate user.controller.ts

* DocUpdate user.entity.ts

* DocUpdate user.controller.spec.ts

* DocUpdate user.controller.spec.ts

* DocUpdate user.controller.ts

* DocUpdate user.entity.ts

* DocUpdate user.module.ts

* DocUpdate user.service.spec.ts

* DocUpdate user.service.ts

* DocUpdate mikro-orm.config.ts

* Add comments for the backend classes

* Format code

* Remove @fileoverview comments

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Co-authored-by: neda_moshki <uzijb@student.kit.edu>
Co-authored-by: Neda Moshki <133236496+NedaMoshki@users.noreply.github.com>
Co-authored-by: Florian Raith <florianraith00@gmail.com>