Chore: Generate ERD for `mix phx.gen.auth`

[nelsonic]

Side-quest from: https://github.com/dwyl/auth/issues/207 Todo:

• [x] generate ERD immediately after running mix phx.gen.auth

[nelsonic]

ERD:

Email addresses are stored in-the-clear: 🙄

This is obviously undesirable. 🙃 Going to have to address this tomorrow morning. 💭

[nelsonic]

Similarly the people_tokens table stores email addresses as plaintext in the sent_to column: