Migrate to Postgres

[js0mmer]

Description

• Migrated to postgres
• added drizzle
• refactored routes
  • made sure we are determining userid from session, not letting user dictate it
• refactored login checks on the frontend with a hook
• added course bag routes
• added separate course bag slice

todo

• need to clean up mongoose stuff before merging
• update docs

Steps to verify/test this change:

• Verify changes work as expected on staging instance
• make sure the site still works

Final Checks:

• Verify successful deployment

(optional)

• Write tests
• Write documentation

Issues

Closes #490

[Awesome-E]

Just create the issues for the two unresolved comments, otherwise looks pretty much good to me! Though it wouldn't hurt to get a second opinion from @timobraz