Cleaner Structure

[JackyChiu]

After some peer review in a few issues, I've cleaned up the structure of the program

We now have a handlers packages, which will contain all the handlers.

• The Handler type contains a logger and a database connection.
• There are handlers which are methods on this type which check for auth and call on specific functions depending on the method in the request

[JackyChiu]

Main focus of this PR was to clean the structure of the handlers (touched the models a bit)