plasma-apply-{colorscheme, cursortheme, desktoptheme, wallpaperimage}: add page

[Managor]

• The page(s) are in the correct platform directories: common, linux, osx, windows, sunos, android, etc.
• The page(s) have at most 8 examples.
• The page description(s) have links to documentation or a homepage.
• The page(s) follow the content guidelines.
• The page(s) follow the style guide.
• The PR title conforms to the recommended templates.
• Version of the command being documented (if known):

[Managor]

I found the list of these commands from here: https://github.com/shalva97/kde-configuration-files?tab=readme-ov-file#changing-appearance
I have absolutely no idea what to use as their More information page

[Managor]

ColorScheme, Cursor_Theme and desktop-theme are all intentional to mimic the naming schemes of the themes

[spageektti]

It doesn't look like it is ready for review.

[Managor]

I see no other alternative to just linking the source code.