Adds seed data.

:trumpet:

To test:

- `knex seed:run`
- `node index.js`
- Navigate to `http://0.0.0.0:8080/api/0/objectives`
- Navigate to `http://0.0.0.0:8080/api/0/resources`

#### Todo

- [ ] ~~Separate out the seeding into two separate files~~ nvm. Seeds aren't ordered like migrations.
- [x] Rebase
- [x] Add list seed data

Resolves #28.