Added a grid style to the bookmarks widget

[Panonim]

This pull request adds a new "grid" style option to the bookmarks widget, allowing users to display bookmarks as a grid of icon tiles with titles and descriptions underneath. The implementation includes updates to the widget's configuration, rendering logic, HTML template, and CSS styling, as well as documentation updates.

New "grid" style for bookmarks widget:

• Added a style field to the bookmarks widget configuration, allowing users to select the new "grid" layout. [1] [2] [3]
• Implemented logic in widget-bookmarks.go to render either the default or the new grid template based on the style field.
• Added a new template (bookmarks-grid.html) for the grid layout, displaying bookmarks as icon tiles with titles and descriptions.
• Introduced new CSS classes to support the grid layout and its interactive styles in widget-bookmarks.css.

Documentation updates:

• Updated the configuration documentation and changelog to describe the new grid style option for the bookmarks widget. [1] [2]

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