Update cheatsheets

linux/picom

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+---
+syntax: markdown
+tags: [tldr, linux]
+source: https://github.com/tldr-pages/tldr.git
+---
+# picom
+
+> Standalone compositor for Xorg.
+> More information: <https://wiki.archlinux.org/title/picom>.
+
+- Enable `picom` during a session:
+
+`picom &`
+
+- Start `picom` as a background process:
+
+`picom -b`
+
+- Use a custom configuration file:
+
+`picom --config {{path/to/config_file}}`