Doc: remove --os-file completely

Author: CarterLi

completions/bash

@@ -360,7 +360,6 @@ __fastfetch_completion()
     local FF_OPTIONS_PATH=(
         "-c"
         "--config"
-        "--os-file"
         "--lib-pci"
         "--lib-vulkan"
         "--lib-wayland"

src/data/help.json

@@ -937,14 +937,6 @@
                 "default": "-"
             }
         },
-        {
-            "long": "os-file",
-            "desc": "Set the additional file path which containing OS information",
-            "remark": "Linux only",
-            "arg": {
-                "type": "path"
-            }
-        },
         {
             "long": "disk-folders",
             "desc": "A colon (semicolon on Windows) separated list of folder paths to be detected",