fastfetch: add page (#8550)

pages/linux/fastfetch.md

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+# fastfetch
+
+> A CLI tool to display information about your operating system, software and hardware.
+> More information: <https://github.com/LinusDierheimer/fastfetch>.
+
+- Display system information:
+
+`fastfetch`
+
+- Set the structure of the fetch:
+
+`fastfetch --structure {{structure}}`
+
+- Load a custom config file:
+
+`fastfetch --load-config {{path/to/config_file}}`
+
+- Set the logo to use:
+
+`fastfetch --logo {{logo}}`
+
+- Set the color of the keys and title:
+
+`fastfetch --color {{blue}}`