Streamline auth setup and clean up deprecated code

Removed outdated server and settings files from the specs directory, consolidating configuration into the new `support/settings` path. This reduces redundancy and aligns the setup with best practices in handling authentication configuration. Additionally, unnecessary fetch for authorization code was eliminated from the handler, optimizing parameter parsing. These changes improve maintainability and clarity of the codebase.

spec/spec_helper.cr

@@ -3,7 +3,7 @@ require "digest"
 require "base64"
 require "faker"
 require "../src/authly"
-require "./settings"
+require "./support/settings"
 
 process = nil
 Spec.before_suite do

src/authly/handler.cr

@@ -45,7 +45,6 @@ module Authly
       client_id = params.fetch("client_id", "")
       client_secret = params.fetch("client_secret", "")
       redirect_uri = params.fetch("redirect_uri", "")
-      authorization_code = params.fetch("code", "")
       username = params.fetch("username", "")
       password = params.fetch("password", "")
       refresh_token = params.fetch("refresh_token", "")