plasma-apply-colorscheme, plasma-apply-cursortheme, plasma-apply-desktoptheme, plasma-apply-wallpaperimage: add page (#15445)

Co-authored-by: Juri Dispan <juri.dispan@posteo.net>

pages/linux/plasma-apply-colorscheme.md

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+# plasma-apply-colorscheme
+
+> Switch Plasma color scheme.
+> More information: <https://invent.kde.org/plasma/plasma-workspace>.
+
+- List available color schemes:
+
+`plasma-apply-colorscheme --list-schemes`
+
+- Apply a color scheme:
+
+`plasma-apply-colorscheme {{BreezeLight}}`
+
+- Display help:
+
+`plasma-apply-colorscheme --help`

pages/linux/plasma-apply-cursortheme.md

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+# plasma-apply-cursortheme
+
+> Switch Plasma cursor theme.
+> More information: <https://invent.kde.org/plasma/plasma-workspace>.
+
+- List available cursor themes:
+
+`plasma-apply-cursortheme --list-themes`
+
+- Apply a cursor theme:
+
+`plasma-apply-cursortheme {{breeze_cursors}}`
+
+- Display help:
+
+`plasma-apply-cursortheme --help`

pages/linux/plasma-apply-desktoptheme.md

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+# plasma-apply-desktoptheme
+
+> Switch Plasma desktop theme.
+> More information: <https://invent.kde.org/plasma/plasma-workspace>.
+
+- List available desktop themes:
+
+`plasma-apply-desktoptheme --list-themes`
+
+- Apply a desktop theme:
+
+`plasma-apply-desktoptheme {{default}}`
+
+- Display help:
+
+`plasma-apply-desktoptheme --help`

pages/linux/plasma-apply-wallpaperimage.md

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+# plasma-apply-wallpaperimage
+
+> Switch Plasma wallpaper.
+> More information: <https://invent.kde.org/plasma/plasma-workspace>.
+
+- Apply a wallpaper:
+
+`plasma-apply-wallpaperimage {{/path/to/image}}`
+
+- Apply a wallpaper with a fill mode:
+
+`plasma-apply-wallpaperimage --fill-mode {{stretch|preserveAspectFit|preserveAspectCrop|tile|tileVertically|tileHorizontally|pad}} {{/path/to/image}}`
+
+- Display help:
+
+`plasma-apply-wallpaperimage --help`