Update documentation (#382)

* Added docs how to contibute

* Updated features and other docs

* More cleanup and docs

* Added some missing docs

* syntax and style on shell

* Made some "design" changes

* Added tests for the docs configuration

* Added reference configuration

* Added better tests and more content

* cs

* update config

* Make Configuration final and remove method not used

* Docs update

* fixes

* minor

Author: Nyholm

src/Configuration.php

@@ -12,7 +12,7 @@
  * @author Tobias Nyholm <[email protected]>
  * @author Jérémy Derussé <[email protected]>
  */
-class Configuration
+final class Configuration
 {
     public const OPTION_REGION = 'region';
     public const OPTION_PROFILE = 'profile';
@@ -126,13 +126,4 @@ public function has(string $name): bool
 
         return isset($this->data[$name]);
     }
-
-    public function isDefault(string $name): bool
-    {
-        if (!isset(self::AVAILABLE_OPTIONS[$name])) {
-            throw new InvalidArgument(\sprintf('Invalid option "%s" passed to "%s::%s". ', $name, __CLASS__, __METHOD__));
-        }
-
-        return isset($this->data[$name], self::DEFAULT_OPTIONS[$name]) && $this->data[$name] === self::DEFAULT_OPTIONS[$name];
-    }
 }