Plug router for the Tracker application.

This module is responsible for routing incoming requests to the appropriate controller action.

The router is responsible for:

• Logging all requests
• Parsing the request body
• Routing the request to the appropriate controller action
• Returning a response to the client

The router is not responsible for:

• Performing any business logic

The router is a Plug, which is a module that conforms to the Plug specification. A Plug is a module that implements a call/2 function that takes a Plug.Conn struct and returns a Plug.Conn struct.