Add support for dark mode-specific icons

[StanMenten99]

No description provided.

[what-the-diff]

PR Summary

• Updated Documentation For Dark Mode Icons
  The README.md file has been updated to include information about how to use the newly introduced Dark Mode Icons. It also guides users on how to configure these icons.

• Added Dark Mode Icons Support in Card Grid Component
  Changes in resources/views/components/card-grid.blade.php now facilitate Dark Mode Icons, which would be displayed conditionally based on certain variables ($darkIcons and $renderDarkIconAsImage).

• Implemented Dark Mode Icons Support in Slide-over-list Component
  resources/views/components/slide-over-list.blade.php now also includes Dark Mode Icons, aligning with the updates introduced in the card grid component. This ensures consistency in supporting both light and dark mode icons.

• Introduced Properties and Methods for Dark Mode Icons in PanelSwitch
  In src/PanelSwitch.php, properties for Dark Mode Icons have been introduced (such as darkIcons, renderDarkIconAsImage), along with relative methods to manage these Dark Icons, including data getters for them.

[bezhanSalleh]

Thanks for the PR. the +427 addition sort of triggered something so I took your idea and improved it in #60