Update cheatsheets

tldr/linux/lookandfeeltool

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+---
+syntax: markdown
+tags: [tldr, linux]
+source: https://github.com/tldr-pages/tldr.git
+---
+# lookandfeeltool
+
+> Switch Plasma global themes.
+> More information: <https://userbase.kde.org/System_Settings/Look_And_Feel>.
+
+- List available global themes:
+
+`lookandfeeltool --list`
+
+- Apply a global theme:
+
+`lookandfeeltool --apply {{org.example.theme.desktop}}`
+
+- Operate `lookandfeeltool` without a display server:
+
+`lookandfeeltool --platform offscreen`
+
+- Display help:
+
+`lookandfeeltool --help`