Feat: Isolate Shortcut Guide

[DiogoRDuarte]

Because

• The default ShortcutGuide was not customizable by the developer in terms of CSS.
• Developers could not use their own Custom ShortcutGuide components.
• AutoVizuA11y , while directly manipulating the DOM, was expecting the ShortcutGuide to have specific classNames.

Refactor

• Added a prop to AutoVizuA11y that enables the ShortcutGuide to be overwritten (if this prop is no filled, a default one is used instead);
• Made the styles of the default ShortcutGuide customizable by following the BEM patterns;
• Made the creation of the ShortcutGuide more dynamic, using a data object as input and making it so the creation of multiple columns is dynamic;
• Verifications of the active element no longer use specific classNames;
• Converted the ShortcutGuide from a table to divs given the lack of benefits from the first approach;
• Changed the README accordingly.