removes migrations and not needed factory, changes references

[Dongata]

🅱️ ackground

In the context that this is a seeder project, isn't a good practice add implementations, so, sql server implementation must go.

Changes done

• Removes an unnecessary factory
• Changes the packages needed
• Changes the dbcontext configuration

Notes

Sorry guy that created the factory, was lovely and will be remembered.

Demo

[matiasbeckerle]

Fixes #16.