Update seeds architecture

[DenisZackharov]

Summary

Now for create seeds for development need to execute rails db:seed:developement

How it works

Screenshots/screencasts of the pull request introduced functionality.

Test plan

List of steps to manually test introduced functionality:

1. Run rails db:seed:developement
2. Check that users with roles [super_admin, teacher, head_teacher, director] was created (if not existed already)

Checklist:

• [x] I have performed a self-review of my own code
• [ ] I have added tests for new functionality
• [x] My pull request is shorter than 300 lines

Deploy notes

Notes regarding deployment the contained body of work. These should note any db migrations, ENV variables, services, scripts, etc.