Refactor/Project-structure

[sanriodev]

Is your feature request related to a problem? Please describe.
move db/model specific folders into models folder like so:

src/
└── modules/
----------------├── discord/
----------------├── event/
----------------├── commands/
----------------├── models/
------------------------------├── version/
------------------------------├── birthday/
------------------------------├── poll/
------------------------------└── someoneoncesaid/