Panels navigation documentation

[ModestasV]

Description

Documentation updates for Panels -> Navigation.

This includes a few non-documentation updates:

1. I have refactored the routes to be grouped instead of the panels/navigation... prefix (Commit)
2. Fixed a bug with the generation script where having a Dark preference would not generate Light screenshots (Commit)

And, of course, added images for:

• https://filamentphp.com/docs/3.x/panels/navigation#customizing-a-navigation-items-icon
• https://filamentphp.com/docs/3.x/panels/navigation#switching-navigation-item-icon-when-it-is-active
• https://filamentphp.com/docs/3.x/panels/navigation#sorting-navigation-items
• https://filamentphp.com/docs/3.x/panels/navigation#collapsible-sidebar-on-desktop
• https://filamentphp.com/docs/3.x/panels/navigation#registering-custom-navigation-items
• https://filamentphp.com/docs/3.x/panels/navigation#using-top-navigation
• https://filamentphp.com/docs/3.x/panels/navigation#adding-a-badge-to-a-navigation-item
• https://filamentphp.com/docs/3.x/panels/navigation#grouping-navigation-items
• https://filamentphp.com/docs/3.x/panels/navigation#making-navigation-groups-not-collapsible
• https://filamentphp.com/docs/3.x/panels/navigation#disabling-navigation

In one case, I had to split the text better to visualize the difference (Collapsible vs. not group).

Other than that - let me know if this is okay :)

Visual changes

None

Functional changes

• Code style has been fixed by running the composer cs command.
• Changes have been tested to not break existing functionality.
• Documentation is up-to-date.